致命的|ちめいてきchimeiteki

1. na-adjectivefatal; lethal
   そのスキャンダルは彼かれの政治的せいじてき将来しょうらいに致命的ちめいてきであった。↗

   The scandal was fatal to his political future.

• Synonym致死的ちしてきWrittenWritten/formal: very likely to cause death; used mostly in medical and poison descriptions. 「致命的」 also has the figurative sense of a fatal blow to something's survival.
• Related殺人的さつじんてきNeutralNeutral: unbearably harsh, as if it could kill you, e.g. 「殺人的な暑さ」「殺人的スケジュール」; mostly hyperbole rather than literal lethality.
• Antonym軽微なNeutralNeutral antonym: slight, very small in degree; the opposite of 「致命的」.

Use 「致命的」 for something that endangers life or something's survival, as in 「致命的なミス」. In medical contexts use 「致死的」 for what can cause death; use 「殺人的」 for exaggerated 'killer' harshness.

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

1. 生命せいめいに関かかわる様子ようす。
2. 何なんかの物事ものごとの存続そんぞくに関かかわる様子ようす。