悪事|あくじakuji[1]atamadaka (head-high)

1. nounevil deed; wrongdoing; crime; vice
   他人たにんの悪事あくじを引き合ひきあいに出だして自分じぶんの悪事あくじの言い訳いいわけをすることはできない。↗

   Two wrongs don't make a right.
2. nounmisfortune; calamity

• Synonym罪つみNeutralCovers crimes and sins but also punishment and responsibility, a wider range than 「悪事」, as in 「罪を犯す」.
• Synonym非行ひこうNeutralMisconduct that defies morality, especially delinquency among young people, as in 「非行少年」; 「悪事」 is not restricted to any group.
• Synonym罪悪ざいあくWrittenEvil that defies law, morals or religion, carrying a moral-judgement tone, as in 「罪悪感」; more abstract than 「悪事」.
• Synonym不義ふぎWrittenBetrayal of moral duty, also adultery, as in 「不義の子」; has an old-fashioned ring, while 「悪事」 is the general word for bad deeds.
• Synonym悪行あくぎょうWrittenClose to 「悪事」 in meaning but more at home in written or literary prose, as in 「悪行の限りを尽くす」.
• Synonym罪科ざいかWrittenCrimes against law or morals, and the punishment they incur; rare even in written prose — say 「罪」 or 「悪事」 in daily speech.
• Synonym罪過ざいかWrittenActs or faults that defy law and morals, but rare even in written prose; 「悪事」 is far more common for concrete bad deeds.
• Synonym不正行為ふせいこういNeutralAn act of cheating or of using unfair means for gain, such as 「不正行為」 in examinations; the emphasis is on breaking the rules.
• Synonym醜行しゅうこうWrittenDisgraceful deeds that invite public censure, with a strong shade of shame; rare in writing. 「悪事」 does not stress shame.
• Synonym犯罪行為はんざいこういFormalA legal term for an act that constitutes a crime; more formal than 「悪事」, which need not involve breaking the law.
• Synonym汚行おこうWrittenDeeds that would shame one if known; very rare even in written prose. Close to 「醜行」 in sense and likewise tinged with shame.
• Related悪徳あくとくNeutralImmorality, especially swindling others for gain; often used to modify nouns, as in 「悪徳商法」. 「悪事」 points to concrete bad deeds.
• Related過ちあやまちNeutralFaults or lapses, mostly unintentional, though it can also mean wrongdoing; 「悪事」 is evil done on purpose.
• Related不始末ふしまつNeutralMishandling something and causing trouble for others, as in 「不始末をしでかす」; not necessarily out of malice.
• Related非ひNeutralUnreasonableness or fault, as in 「非を認める」; centres on right and wrong, while 「悪事」 means concrete bad acts.
• Related悪あくNeutralEvil as an abstract concept, as in 「悪と戦う」; 「悪事」 is a bad deed actually committed.
• Related間違いまちがいNeutralMistakes and errors, also a euphemism for sexual indiscretion; usually unintentional, unlike the deliberate 「悪事」.
• Related過失かしつNeutralErrors caused by carelessness; in law it stands opposite to intent, whereas 「悪事」 is done deliberately.
• Related落ち度おちどNeutralA blunder that deserves blame, with the focus on who is at fault, as in 「こちらに落ち度はない」; not deliberate wrongdoing.
• Related過誤かごWrittenErrors or slips, found mostly in specialist fields, as in 「医療過誤」; it lacks the intent implied by 「悪事」.
• Related不埒ふらちWrittenA condemnatory adjective for conduct defying morals or law, as in 「不埒な輩」; 「悪事」 is a noun naming the deed itself.
• Related過怠かたいWrittenNegligence or carelessness; also a medieval samurai penalty of atonement. Very rare, and implies no deliberate evil.
• Antonym善行ぜんこうWrittenGood deeds, leaning towards written prose, as in 「善行を積む」; the direct opposite of 「悪事」 on the scale of good and evil.
• Antonym良い行いNeutralA plain, everyday way of saying good deeds; opposite to 「悪事」 in moral terms, though 「善行」 is preferred in writing.

For bad deeds in general, 「悪事」 is the default, as in 「悪事を働く」. Use 「罪」 for offences and guilt, 「非行」 for juvenile delinquency, and 「過ち」 or 「過失」 for unintentional slips. 「悪徳」 flags immorality in modifiers like 「悪徳商法」, 「罪悪」 is abstract evil with a moral tone, and 「犯罪行為」 is the formal legal term. For plain mistakes choose 「間違い」; the antonym is 「善行」, or everyday 「良い行い」.

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

1. 悪わるい行おこない。