危害|きがいkigai[1]atamadaka (head-high)

1. nouninjury; harm; danger
   どんな理由りゆうがあっても他人たにんに危害きがいを加くわえてはいけない。↗

   You should not inflict any injury on others on any account.

• Synonym害がいNeutralBroad word for harm or bad influence in general, as in 「害がない」「健康に害がある」; 危害 leans toward danger to life and body.
• SynonymダメージNeutralLoanword for damage or a blow, as in 「ダメージを受ける」; covers mental and economic harm too, and is common in speech.
• Synonym害悪がいあくWrittenWritten word for something harmful and bad, as in 「社会の害悪」, with a moral tinge of disapproval; 危害 stresses the threat to life and body.
• Related損害そんがいNeutralDamage or loss suffered, to property or persons alike, as in 「損害賠償」; 危害 stresses danger to life and body.
• Related傷害しょうがいWrittenWritten word for bodily injury — the act of harming or the wound suffered — as in 「傷害事件」「傷害保険」; common in legal and insurance use. 危害 also implies danger.
• Related損傷そんしょうWrittenWritten word for damage to an object or the body, as in 「脳の損傷」「車体の損傷」; focuses on the damaged state, while 危害 focuses on the danger of harming.
• Related毀損きそんFormalFormal word for damaging things or harming reputation and credit, as in 「名誉毀損」; mostly in legal documents. Not used for danger to life.
• Related弊害へいがいWrittenWritten word for the bad effects or side effects something brings, as in 「弊害が生じる」; used for systems and customs, also harm to health. 危害 stresses danger to life.
• Antonym保護ほごNeutralAntonym: protecting something from harm, as in 「自然保護」; opposite of 危害, which means harming or endangering safety.
• Antonym安全あんぜんNeutralAntonym: the state of being free from danger and harm, as in 「安全運転」; opposite of 危害 as a threat to life.
• Antonym恩恵おんけいNeutralAntonym: a blessing or benefit one receives, as in 「恩恵を受ける」; contrasts with 危害 in bringing good rather than harm.

Use 「危害」 for danger or harm to life and the body, as in 「危害を加える」「危害が及ぶ」. For harm in general say 「害」, for damage or loss suffered 「損害」, and for the bad effects that follow 「弊害」. 「ダメージ」 is a colloquial loanword for damage; 「傷害」 and 「損傷」 are written words for injury and damage; 「毀損」 is formal for property or reputation damage; 「害悪」 is written for evil influences; antonyms: 「保護」「安全」「恩恵」.

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

1. 生命せいめいなどを損そこなうような危険きけんなこと。