百折不挠 vs 马马虎虎: Which Chengyu Fits?

How to decide

1. Reach for 百折不挠 when the sentence points to to remain unyielding after many setbacks. Its tone is admiring and determined, and the safest first test is whether the context resembles personal resilience, team effort, language learning.
2. Bring in 马马虎虎 when the sentence points to so-so, careless, or just passable depending on context. Its tone is neutral to mildly negative, and the strongest clue usually looks closer to negative judgment, self-evaluation, everyday review.
3. The shared ground is narrow: both appear in learning situations. The difference is not the Chinese topic label but the job each phrase performs in a sentence.
4. A safe English first pass is unyielding for 百折不挠 and so-so for 马马虎虎, then check whether the surrounding sentence needs praise, warning, correction, or neutral description.

Wrong choice checks

• 百折不挠: Do not use it for stubbornness when the method is clearly wrong.
• 马马虎虎: Do not translate it as a phrase about actual horses or tigers.
• Do not let the story image do all the work. Check what the speaker is judging before you pick either phrase.
• Do not swap the two phrases just because they share a theme. A nearby topic can still carry the wrong social judgment.

Where this comparison comes from

• Both phrases have full dictionary entries with examples, source notes, and usage boundaries.
• The comparison uses entry-level source references instead of adding new historical claims on the compare page.
• The page exists because learners often need to reject a near phrase, not only recognize a single chengyu.

• 百折不挠: CC-CEDICT dictionary cross-check via MDBG
  Used to cross-check the modern headword, pinyin, and broad dictionary sense for 百折不挠; this is not treated as the story source.
• 百折不挠: Wiktionary open lexical reference
  Used as an open lexical reference for English readers checking the headword and common translation range for 百折不挠; usage decisions still come from examples on this page.
• 百折不挠: Chinese Text Project dictionary locator
  Used as a classical-text locator and Chinese reference cross-check for 百折不挠; the entry still rewrites the learner explanation in this site's own order.
• 马马虎虎: CC-CEDICT dictionary cross-check via MDBG
  Used to cross-check the modern headword, pinyin, and broad dictionary sense for 马马虎虎; this is not treated as the story source.
• 马马虎虎: Wiktionary open lexical reference
  Used as an open lexical reference for English readers checking the headword and common translation range for 马马虎虎; usage decisions still come from examples on this page.
• 马马虎虎: Chinese Text Project dictionary locator
  Used as a classical-text locator and Chinese reference cross-check for 马马虎虎; the entry still rewrites the learner explanation in this site's own order.

Visual memory: The board keeps both phrases visible at once so the learner decides by tone, context, and mistake boundary.