不義|ふぎfugi[1]atamadaka (head-high)

1. no-adjectiveimmorality; injustice; misconduct; impropriety; perfidy
2. no-adjectiveadultery; infidelity; cuckoldry
3. no-adjectivemurdering one's teacher or a government official

• Synonym不正ふせいNeutralThe everyday word for wrongdoing that breaks rules — 「不正行為」, 「不正アクセス」. Centers on rule violations, not moral betrayal.
• Synonym悪事あくじNeutralBad deeds in everyday speech, as in 「悪事を働く」. Concrete wrongdoing, without the bookish, moralistic air of 「不義」.
• Synonym背信はいしんNeutralBreach of trust or good faith; the law has related offenses such as 「背任」. Focused on violated trust and duty.
• Synonym不正行為ふせいこういNeutralConcrete unfair practices — exam cheating, malpractice — as specific acts of rule-breaking, while 「不義」 is about breaching morality or fidelity.
• Synonym不道徳ふどうとくNeutralImmoral at the level of ethics — going against morality itself. Modern and direct, where 「不義」 sounds dated and literary.
• Synonym悪行あくぎょうWrittenWicked deeds in written style, as in 「悪行の数々」. Bookish like 「不義」, but it tallies bad acts rather than naming the breach of duty.
• Related不当ふとうNeutralUnfair or unjustified, as in 「不当解雇」. Targets improper treatment or decisions, not moral corruption.
• Related不法ふほうNeutralUnlawful — breaking the law, as in 「不法投棄」. The natural choice when legality is the issue; 「不義」 appeals to morality instead.
• Related悪あくNeutralEvil in the abstract, and also the villain or bad guy in a story. A broad, general term; 「不義」 is narrower — a breach of morality or fidelity.
• Related裏切りうらぎりNeutralBetrayal — the everyday word for turning against someone who trusted you. Focuses on broken trust rather than the moral code 「不義」 invokes.
• Related反逆はんぎゃくNeutralRevolting against a ruler or lord — the uprising itself. 「不義」 passes moral judgement; 「反逆」 names the act of rebellion.
• Related謀反むほんNeutralTaking up arms against those in power, now mostly historical, as in 「本能寺の謀反」. A specific old crime, not a general moral label.
• Related邪よこしまNeutralWicked or crooked in heart and intent, as in 「邪な考え」. Describes a perverse mind or character; 「不義」 names the wrongful deed.
• Related悪徳あくとくNeutralVice driven by self-interest, as in 「悪徳業者」. Points to unscrupulous, profit-seeking wickedness rather than a breach of duty.
• Related情事じょうじNeutralA love affair between a man and a woman; centers on the relationship itself and need not be a moral offense, unlike 「不義」.
• Related寝返りねがえりCasualColloquial: defecting to the other side, double-crossing — and literally rolling over in bed. Casual next to the formal 「不義」.
• Related不誠実ふせいじつNeutralInsincerity or dishonesty toward others — lacking good faith. About personal sincerity, not the broader moral breach 「不義」 implies.
• Related不届きふとどきNeutralImproper, inexcusable behavior, said with a scolding tone, as in 「不届き者」; a neutral word, unlike the bookish, old-fashioned 「不義」.
• Related曲事きょくじWrittenArchaic and rarely used; for wrongdoing today say 「不正」 or 「悪事」.
• Related色事いろごとCasualColloquial, dated word for amorous affairs; highlights the romance itself and does not stress any breach of morality, unlike 「不義」.
• Related内応ないおうWrittenWritten style: secretly siding with the enemy from within, betraying one's master. A concrete act of treachery, not a general moral term.
• Related内通ないつうWrittenWritten style: secretly communicating with the enemy, and by extension an illicit affair — spans both treachery and adultery.
• Related密通みっつうWrittenWritten and often historical: adultery or a secret liaison, also covert contact with the enemy. Closest to 「不義」 in its adultery sense.
• Antonym正義せいぎNeutralThe antonym: justice and righteousness — the very thing 「不義」 violates.

「不義」 is bookish and old-fashioned: a breach of morality or fidelity, as in 「不義の子」 and 「不義を働く」. For modern rule-breaking say 「不正」; for law-breaking, 「不法」. Use 「悪事」 or 「不正行為」 for concrete bad acts, 「不当」 for unfair treatment, 「裏切り」 or 「背信」 for betrayal, 「反逆」 or the historical 「謀反」 for revolt. For affairs, 「情事」 is neutral, 「色事」 colloquial, and 「密通」 the written near-match for the adultery sense of 「不義」. 「正義」 is its antonym.

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

1. 道義どうぎに外はずれること。悪逆あくぎゃくであること。
2. (歴史れきし)中国ちゅうごくや日本にっぽんの古代こだいの刑法けいほう規きである律りつに定さだめられた犯罪はんざい類型るいけいで、主人しゅじんや師匠ししょうを殺傷さっしょうすること。中国ちゅうごくでは十じゅう悪あくの9番目ばんめ、日本にっぽんでも八虐はちぎゃくの8番目ばんめの重大じゅうだい犯罪はんざいとされた。
3. 男女だんじょの道みちに外はずれた関係かんけい。