非道|ひどうhidou[0]heiban (flat)

1. na-adjective, no-adjectiveunjust; inhuman

• Synonym極悪ごくあくWrittenUtterly wicked; written/formal prose, often in 「極悪非道」, extreme in degree.
• Synonym残虐ざんぎゃくWrittenSavage cruelty; written/formal prose, stressing abusive, ferocious treatment, used mostly for atrocities.
• Synonym残酷ざんこくNeutralCruel, stressing making people or animals suffer; common in everyday use.
• Synonym邪悪じゃあくWrittenWicked; written/formal prose, stressing evil intent, with a strong good-versus-evil coloring.
• Synonym暴虐ぼうぎゃくWrittenTyrannical; written/formal prose, stressing the oppressive cruelty of rulers and those in power.
• Synonym無残むざんWrittenHorrific; written/formal prose, stressing a tragic, miserable scene — the outcome rather than the act.
• Synonym凶悪きょうあくWrittenVicious; written/formal prose, often in 「凶悪犯罪」, stressing the heinous nature of a crime.
• SynonymひどいNeutralCruel and pitiable, stressing cold-hearted treatment of people; colloquial; the same word as 「惨い」 above.
• Synonym極道ごくどうWrittenWicked conduct or the criminal underworld; written/formal prose; also refers to a dissipated, profligate life.
• Related悪いわるいNeutralMostly a suffix attached to verbs meaning hard to do, as in 「読みにくい」; its sense is not really close to 「非道」's violation of humanity.
• Related不正ふせいNeutralWrongdoing or dishonesty, stressing rule-breaking and fraud, as in 「不正行為」; stays at the level of rules, not inhumanity.
• Related不当ふとうNeutralUnfair or unreasonable, as in 「不当解雇」 or 「不当な要求」; stresses unfairness, while 「非道」 stresses cruelty and inhumanity.
• Related不法ふほうNeutralIllegal, stressing violation of the law, as in 「不法投棄」; does not imply cruelty.
• Related残忍ざんにんNeutralBrutal, stressing doing cruel things without compunction; fits both people and acts, as in 「残忍な事件」.
• Related悪質あくしつNeutralNasty or malicious, stressing the bad quality of the act, as in 「悪質な詐欺」; focuses on the methods used.
• Related悪辣あくらつWrittenVicious and crafty; written/formal prose, stressing underhanded methods, as in 「悪辣な手口」.
• Related不届きふとどきWrittenOutrageous or rude; written/formal prose, stressing breach of rules and decorum, milder than 「非道」.
• RelatedむごいNeutralCruel and pitiable, stressing treatment too horrible to watch; leans toward depicting the feelings the scene arouses.
• Related無慈悲むじひWrittenMerciless; written/formal prose, stressing coldness and a complete lack of compassion or human feeling.
• Antonym人道じんどうNeutralHumanity — the path one must keep as a human being; the direct opposite of 「非道」's defiance of reason and human feeling.
• Antonym仁義じんぎWrittenBenevolence and justice, humanity and righteousness; the opposite of 「非道」's inhumanity and injustice.

Use 「非道」 for conduct that defies reason and humanity — cruel, inhuman treatment — often as 「極悪非道」 or 「非道な仕打ち」. For cruelty in everyday use pick 「残酷」 or 「残忍」; for unfairness or unreasonableness pick 「不当」.

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

1. 道理どうりや人情にんじょうに反はんすること。