This is the 9670th most frequent Japanese word.
致命
"致命" means "fatal" or "deadly."
致命的 is used to describe something having fatal or critical impact.
この事故は彼に致命的な怪我を引き起こしました。
This accident caused him a fatal injury.
The term 致命的 is used metaphorically to highlight the critical importance of a mistake.
その企業の致命的な失敗が破産を招いてしまった。
The company's fatal mistake led to bankruptcy.
致命的 emphasizes the decisive and irreversible consequences.