CYChengyu Dictionary

Chengyu meaning

入木三分 (rù mù sān fēn)

deeply penetrating and incisive

Plain Answer

Source: Wang Xizhi calligraphy anecdote tradition. Treated here as classical story; read it first as a sentence-level judgment.

Core meaning: 入木三分 means deeply penetrating and incisive: Used to praise writing, analysis, calligraphy, or criticism that penetrates deeply into the essence of a matter.

Practice this meaningRead the story
Label
negative / formal approving
Best objects
analysis, calligraphy, tone boundary
Do not use when
Do not use 入木三分 for a scene that only shares one surface word with the meaning. If the problem is closer to 一针见血 or the contrast points toward 马马虎虎, choose that nearby entry instead of stretching this one.

Use: Use 入木三分 when the analysis sentence shows the object, cause, and tone clearly. Avoid: Avoid 入木三分 when the sentence only sounds related, lacks evidence, or needs a plainer word.

analysis这篇评论入木三分，指出了问题的根源。Zhe pian pinglun ru mu san fen, zhichu le wenti de genyuan.This review is incisive and points out the root of the problem.

Next: Read the examples, then compare 一针见血 before practicing 入木三分 in the focused quiz.

Often studied with: 一针见血, 鞭辟入里, 洞若观火

Read This First

入木三分 is introduced here through a classical story tradition retold for modern learners; the source label is Wang Xizhi calligraphy anecdote tradition, and the page separates that background from modern sentence choice.

入木三分 means deeply penetrating and incisive. The important first reading is Used to praise writing, analysis, calligraphy, or criticism that penetrates deeply into the essence of a matter. This is a negative phrase in normal use, so the sentence must show the judgment clearly.

Use 入木三分 when the object, cause, and tone match examples such as analysis, calligraphy, tone boundary; then compare 一针见血 and 鞭辟入里 before writing your own sentence.

Avoid 入木三分 when the sentence only shares a broad topic, when the tone would be unfair to the person being described, or when a plainer word would be clearer than a chengyu.

Start with this cue: analysis plus a visible reason.

Meaning and Translation Notes

Used to praise writing, analysis, calligraphy, or criticism that penetrates deeply into the essence of a matter.

Literal meaning

enter the wood three-tenths of an inch

  • 入木 / enter the wood
  • 三分 / three fen deep

English equivalents

  • incisive near

    Use this when the writing, criticism, or analysis reaches the essence rather than staying at surface detail.

  • deeply penetrating plain

    incisive is concise for analysis, while deeply penetrating preserves the physical image

  • cuts to the core plain

    This is safer when the audience needs the meaning without extra cultural explanation.

How To Use It

Use 入木三分 when the reader can see why deeply penetrating and incisive is the exact judgment, not just the topic. A strong sentence names the actor, the thing being judged, and the evidence that makes this idiom more precise than an ordinary adjective.

  • Use it when the writing, criticism, or analysis reaches the essence rather than staying at surface detail.
  • The tone is admiring and analytical, so the surrounding sentence should make the judgment visible.
  • It works in analysis, calligraphy, tone boundary contexts when the boundary is clear.

Common Mistakes

Do not use 入木三分 for a scene that only shares one surface word with the meaning. If the problem is closer to 一针见血 or the contrast points toward 马马虎虎, choose that nearby entry instead of stretching this one.

  • Do not use it when a comment is merely long, harsh, or detailed without deep insight.
  • Do not choose it only because the English gloss "incisive" feels close; compare yi-zhen-jian-xue first.

Wrong Use Clinic

The most useful check is often the phrase you should reject.

  1. The learner wants to sound more idiomatic but has only a broad topic match for 入木三分.

    The sentence drops in 入木三分 without showing the cause, object, or tone that would make the idiom necessary.

    Fix: Rewrite the sentence so the evidence for deeply penetrating and incisive appears before or after the phrase.

    入木三分 fails in this case because a chengyu is not decoration; it must name the exact judgment the sentence is making.

    Compare yi zhen jian xue

  2. The learner wants to say the opposite or a neighboring idea and chooses 入木三分 because it feels familiar.

    The sentence uses 入木三分, but the described situation points to a different cause, time point, or social attitude.

    Fix: Compare the sentence with 马马虎虎 and choose the phrase whose boundary explains the situation with less force.

    入木三分 becomes misleading when the nearby phrase would identify the real problem more cleanly.

    Compare ma ma hu hu

  3. The learner has the right meaning area for 入木三分 but ignores register and emotional force.

    The sentence uses 入木三分 directly about a person, yet gives no softening context or evidence for such a admiring and analytical judgment.

    Fix: Add the observed behavior first, or choose 鞭辟入里 if the sentence needs a gentler learning path.

    入木三分 can sound heavier than a short English gloss. The reader needs enough context to see why the tone is fair.

    Compare bian pi ru li

  4. The learner remembers the origin image of 入木三分 but applies it to the wrong object.

    The sentence names an image or story detail, but the real object being judged would be better explained by another chengyu.

    Fix: Name the object first. If the object points toward 掉以轻心, use that contrast instead.

    入木三分 should follow the judgment, not the most memorable image. Story memory is useful only when it supports the sentence-level decision.

    Compare diao yi qing xin

Chengyu Often Studied Together

Use these clusters to build sentence-level judgment instead of memorizing a single gloss.

  1. 入木三分 with nearby learner choices

    入木三分 is often studied beside 一针见血 and 鞭辟入里 because the words share a theme while asking the learner to judge a different cause, tone, or timing.

    老师先让学生解释入木三分，再比较一针见血和鞭辟入里，这样不会只凭英文近义词选答案。

    yi zhen jian xuebian pi ru li

  2. 入木三分 with contrast checks

    入木三分 becomes easier to use when it is contrasted with 洞若观火 and 马马虎虎; the contrast forces the writer to decide whether the sentence is praise, warning, correction, or neutral description.

    写作练习里先用入木三分造句，再换成洞若观火，观察判断方向怎样改变。

    dong ruo guan huoma ma hu huyi zhen jian xue

  3. 入木三分 in example-building drills

    入木三分 should be practiced with 一针见血 and 洞若观火 because examples reveal whether the learner is choosing by meaning, tone, or only by a remembered image.

    课堂上先用入木三分写一个有证据的句子，再换成一针见血或洞若观火说明判断为什么改变。

    yi zhen jian xuedong ruo guan huobian pi ru li

  4. 入木三分 in story and source review

    入木三分 links best with 鞭辟入里 and 马马虎虎 when the learner is checking whether a source image truly supports a modern sentence.

    复习出处时，不要只背入木三分的故事，还要比较鞭辟入里，看哪个成语更能解释现代句子。

    bian pi ru lima ma hu huyi zhen jian xue

Learner Guide

Use these notes when deciding whether this chengyu fits a real sentence.

Use 入木三分 when the writing, criticism, or analysis reaches the essence rather than staying at surface detail. This first test keeps the phrase from spreading across every nearby topic. Before using it, identify the speaker, the object being judged, and the reason a plain word would miss the Chinese nuance.

For English translation, incisive is concise for analysis, while deeply penetrating preserves the physical image. Do not choose an English phrase only because it sounds idiomatic. The translation should preserve tone, register, and the situation logic before it tries to sound compact.

The main misuse risk is when a comment is merely long, harsh, or detailed without deep insight. That boundary matters because chengyu often share a theme while judging different causes, time points, or social attitudes. A nearby phrase can be familiar and still be wrong.

Before using it in your own sentence, show the surface issue, the deeper root, and the exact insight that reaches it. Then compare the sentence with yi-zhen-jian-xue and bian-pi-ru-li. If one nearby entry explains the situation with less force or more precision, choose that entry instead.

Before using 入木三分, write the plain English idea first. If the plain sentence already says everything naturally, the chengyu must add a sharper judgment, cultural image, or tone. If it does not add one of those, leave the plain wording alone.

A good 入木三分 sentence contains an object and evidence. The object is the person, plan, habit, result, or scene being judged. The evidence is the reason the phrase fits. Without both parts, the idiom may look learned but feel empty.

Compare 入木三分 with 一针见血 and 马马虎虎 before finalizing a sentence. The goal is not to memorize synonyms; the goal is to reject the wrong phrase for a clear reason. That rejection is what turns recognition into usable knowledge.

When teaching or self-reviewing 入木三分, ask the learner to mark source, meaning, use case, wrong case, and one example. If any mark is missing, return to the entry section that supplies it rather than guessing from the headword alone.

analysis is the first test zone for 入木三分, but it is not the only possible use. Before using the phrase, name the speaker, the object being judged, and the nearest tested context: analysis, calligraphy, tone boundary, usage boundary, misuse boundary, comparison check, context setup, teacher correction. Then choose among incisive, deeply penetrating, cuts to the core as translation candidates and reject at least one candidate out loud. A useful final check is to compare the sentence with yi-zhen-jian-xue and bian-pi-ru-li; if one of those nearby entries explains the situation with less strain, the nearby phrase is the better learner choice.

When 入木三分 is translated as incisive, the English should still preserve the phrase's tone. Keep admiring and analytical and the wisdom use area visible when the audience is still learning the idiom. If a short translation hides the warning "Do not use it when a comment is merely long, harsh, or detailed without deep insight.", choose a fuller English explanation instead. This matters because the strongest chengyu pages should help readers decide when not to use the most convenient English equivalent.

Example Sentences

Each example labels the situation so you can choose a natural English translation.

analysis

这篇评论入木三分，指出了问题的根源。

Zhe pian pinglun ru mu san fen, zhichu le wenti de genyuan.

This review is incisive and points out the root of the problem.

calligraphy

他的书法笔力入木三分，难怪大家称赞。

Ta de shufa bili ru mu san fen, nanguai dajia chengzan.

His calligraphy has deeply penetrating brush strength, so it is no wonder people praise it.

tone boundary

入木三分不是话说得狠，而是看得深。

Ru mu san fen bu shi hua shuo de hen, er shi kan de shen.

入木三分 is not about speaking harshly; it is about seeing deeply.

usage boundary

只有原因和语气都清楚时，这句话才适合用入木三分。

zhi you yuan yin he yu qi dou qing chu shi zhe ju hua cai shi he yong ru mu san fen

Only use 入木三分 when the cause and tone are both clear, not just because the topic feels nearby.

misuse boundary

如果只是普通情况，不要为了显得有文化而硬说入木三分。

ru guo zhi shi pu tong qing kuang bu yao wei le xian de you wen hua er ying shuo ru mu san fen

If the situation is ordinary, do not force 入木三分 just to make the sentence sound more cultured.

comparison check

比较近义成语以后，再决定这里是不是应该写入木三分。

bi jiao jin yi cheng yu yi hou zai jue ding zhe li shi bu shi ying gai xie ru mu san fen

After comparing nearby chengyu, decide whether 入木三分 is really the phrase the sentence needs.

context setup

这段话先说明对象和原因，所以入木三分读起来不突兀。

zhe duan hua xian shuo ming dui xiang he yuan yin suo yi ru mu san fen du qi lai bu tu wu

The passage names the object and cause first, so 入木三分 does not feel abrupt.

teacher correction

老师让学生先解释为什么不用别的词，再用入木三分造句。

lao shi rang xue sheng xian jie shi wei shen me bu yong bie de ci zai yong ru mu san fen zao ju

The teacher asks students to explain why another phrase would be wrong before writing a sentence with 入木三分.

Story and Cultural Context

The story is often connected with Wang Xizhi's calligraphy, whose brush force was said to enter the wood deeply. Modern learners usually need the phrase as a decision tool. It tells them when a situation has crossed a specific boundary, not merely which English word looks similar. In the examples here, the phrase is tested against analysis, calligraphy, tone boundary so the reader can see how the meaning changes with use. The safest reading is to keep the image, the tone, and the social situation together. The story is often connected with Wang Xizhi's calligraphy, whose brush force was said to enter the wood deeply. For English speakers, the useful memory is not only the literal image but the decision it makes possible. The examples test analysis, calligraphy, tone boundary so the phrase remains tied to real use instead of becoming a decorative translation label. For this entry, the origin note is only the beginning of the explanation. The useful question is why 入木三分 survived as a portable judgment rather than as a decorative allusion. The classical story route gives the reader an image, but the modern sentence must still prove its own fit. A learner should ask three things: what concrete object is being judged, what evidence in the sentence supports that judgment, and what tone the phrase adds that a plain English adjective would not add. This is why the page tests 入木三分 through analysis, calligraphy, tone boundary, usage boundary, misuse boundary; each context changes the pressure on the phrase and shows whether the idiom is acting as praise, warning, neutral description, or criticism. The story or usage background also has a translation boundary. 入木三分 can point toward incisive, deeply penetrating, cuts to the core, but those English choices are not interchangeable. One version may preserve the image, another may sound natural in a classroom answer, and another may be safer in a workplace or essay sentence. The entry therefore treats public references as source cards, not as a paragraph order to imitate. Headword checks, story labels, and English equivalents are separated first; only after that are they rebuilt into the learner path used here: answer, label, examples, wrong-use clinic, comparison, story, and practice. The most common failure is overextension. Because 入木三分 has a memorable surface, learners may reach for it whenever a topic feels close. The better habit is to compare it with 一针见血 and 鞭辟入里 and with 马马虎虎 and 掉以轻心 before writing. If the rejected phrase is hard to reject, the sentence probably has not supplied enough evidence. If the rejected phrase is easy to reject, the learner can explain the boundary and use 入木三分 with confidence. That is the practical purpose of the origin section: it turns cultural memory into a sentence-level decision instead of leaving the reader with a story and no next action.

Learning point: Real depth is shown by reaching the core, not by adding surface detail.

Open the dedicated story page

Editorial Notes

These notes turn the entry into a decision path, not a loose definition.

First answer before details

入木三分 should first be read as a decision about deeply penetrating and incisive, not as a collectible story label. The classical story helps memory, but the reader's real task is to decide whether the modern sentence is making a negative judgment with enough evidence. Start with the object being described, then ask what happened, who is being judged, and whether the tone is fair. If those details are missing, the idiom will feel like learned decoration rather than useful Chinese. This first-answer rule also helps teachers and translators: they can explain the phrase quickly before deciding whether a longer story, comparison, or correction block is needed.

Example clinic

The examples for 入木三分 deliberately cover analysis, calligraphy, tone boundary, usage boundary, misuse boundary because a learner needs more than one successful sentence before the phrase becomes usable. Read the Chinese sentence, then explain in plain English why this phrase is more precise than a simple adjective or loose translation. A strong example names the context, shows the evidence, and makes the tone visible. A weak example merely places the chengyu near a related topic. This habit prevents a common error: remembering the literal image but forgetting the social judgment carried by the phrase. When the example feels forced, return to the meaning line and choose a plainer wording.

Comparison boundary

Before using 入木三分, compare it with 一针见血 and 鞭辟入里 and, when possible, with 马马虎虎 and 掉以轻心. The comparison is not a synonym game. Nearby chengyu often share effort, caution, wisdom, or evaluation as a topic, while differing in cause, timing, and emotional force. A good learner sentence can explain why the rejected phrase fails. If that explanation is impossible, the chosen idiom is probably too loose. This is also the cleanest internal-link reason: the next page exists because it helps the reader reject a tempting but wrong choice. The comparison should leave a reusable rule, not merely another link to click.

Wrong-use trigger

入木三分 should be rejected when the sentence lacks an object, hides the reason for the judgment, or uses the idiom only because it sounds literary. The safest correction is to rewrite the sentence in plain English first, then add the chengyu only if it sharpens the meaning. If the tone becomes unfair, choose a gentler nearby phrase. If the source image is memorable but the modern object does not match, use the story only as background and do not force the idiom into the sentence. This wrong-use trigger is what keeps the entry from becoming a long but vague dictionary page.

Source synthesis note

入木三分 uses public references as checkpoints rather than as a structure to copy. One source may help with the headword, another with a story or image, and another with English translation range. The page then rebuilds those checks into its own learner order: short answer, label, examples, misuse, collocation, guide, story, and practice. This matters because a single-source paraphrase would give readers a familiar-looking article but not a better learning tool. The editorial value here is the decision path: what to use, what not to use, what to compare, and how to test the phrase in a new sentence.

Practice This Decision

Answer a focused quiz question, then come back to the examples and misuse clinic if the near phrase feels tempting.

Start focused quizReview mistakes first