失敗|しっぱいshippai[0]heiban (flat)

1. noun, suru verb, transitive verb, intransitive verbfailure; mistake; blunder
   １度いちどや２度どの失敗しっぱいはだれにでもある。↗

   Everybody fails once or twice.

• Synonym失策しっさくWrittenWritten word for a blunder in strategy or policy, as in 「外交の失策」; also a fielding error in baseball. More formal than 「失敗」.
• Synonym失態しったいWrittenWritten word for a blunder that costs you face, as in 「失態を演じる」; the emphasis is on the embarrassment, not the outcome.
• Synonym過誤かごFormalFormal term for a fault or error, used mostly in legal or administrative contexts, as in 「過誤納金」.
• Synonym不成功ふせいこうWrittenWritten word for a lack of success, as in 「交渉は不成功に終わった」; a softer, more neutral alternative to 「失敗」.
• SynonymエラーNeutralLoanword for an error or slip, as in 「エラーが出る」; the usual word for computer errors and baseball fielding errors.
• Synonym過失かしつFormalFormal, legal term for a fault caused by carelessness, as in 「過失致死」; the focus is on the negligence itself.
• Synonym錯誤さくごWrittenWritten word for an error of judgment or cognition, as in 「時代錯誤」 and 「試行錯誤」; stresses a mismatch with the facts.
• SynonymミスNeutralLoanword for a mistake or slip, as in 「ケアレスミス」 and 「医療ミス」; centres on doing something wrong, while 「失敗」 is about not succeeding.
• SynonymしくじるCasualColloquial verb for messing up, as in 「試験をしくじる」; can also mean losing one's job over a blunder.
• Synonym過ちあやまちWrittenWritten word for a fault or wrongdoing, as in 「若気の過ち」; moral in colour and often tinged with regret.
• Synonym挫折ざせつWrittenWritten word for a plan or venture being thwarted midway, and for the discouragement that follows, as in 「挫折を味わう」; 「失敗」 is about the outcome.
• Synonym手違いてちがいCasualColloquial for a mix-up in arrangements or procedure, as in 「手違いで届かない」; points to a slip in the process.
• Synonym落ち度おちどCasualA lapse that deserves blame, as in 「こちらに落ち度はない」; used when assigning responsibility.
• SynonymしくじりCasualColloquial noun for botching something, as in 「とんだしくじり」; more casual than 「失敗」 and often self-deprecating.
• Synonym不首尾ふしゅびWrittenWritten word for a matter ending badly, as in 「不首尾に終わる」; can also mean falling out of favour or being unpopular.
• Synonym誤謬ごびゅうWrittenWritten word for a fallacy or an error in theory or thinking, as in 「誤謬を正す」; academic in flavour.
• Synonym蹉跌さてつWrittenRare written word for a plan or venture stalling or being abandoned midway, as in 「事業が蹉跌する」.
• Related不出来ふできCasualColloquial for poor work or a poor result, as in 「不出来な作品」; judges the quality of what was made, not the attempt.
• Related間違いまちがいCasualThe everyday word for an error, as in 「計算の間違い」; frames things as right or wrong, while 「失敗」 frames them as not succeeding.
• Related誤りあやまりWrittenA more written alternative to 「間違い」 for something incorrect, as in 「誤りを正す」.
• Related出来損ないできそこないCasualColloquial for a botched product or a worthless person, as in 「出来損ないの息子」; carries an insulting edge.
• RelatedやりそこないCasualColloquial for fumbling or misdoing a specific action; more concrete than 「失敗」, which speaks of the outcome.
• RelatedしそこなうCasualVerb for botching something or missing a chance; 「失敗」 is the noun for the unsuccessful result.
• Related仕損じるしそんじるCasualVerb for botching a task, as in the proverb 「急いては事を仕損じる」; now mostly seen in set phrases.
• Related仕損ずるしそんずるCasualAn older variant of 「仕損じる」 for botching a task; dated in tone and rarely used today.
• Related間違えまちがえCasualNoun form of 「間違える」 for getting something wrong; common in speech, while 「失敗」 is about not succeeding.
• Antonym成功せいこうNeutralThe antonym of 「失敗」: achieving one's aim, as in 「実験に成功する」; can also mean worldly success.

For something that did not work out, 「失敗」 is the default. Use 「ミス」 for a slip or error and 「間違い」 when the point is right versus wrong. 「失態」 highlights a blunder that costs face, 「過失」 a fault born of carelessness, and 「挫折」 a setback that saps your resolve. In casual speech, 「しくじる」 covers botching something. The opposite is 「成功」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. うまくいかなかったこと。やりそこなうこと。しくじること。