causing disaster or failure
a fatal error/mistake
Any delay would be fatal.
There was a fatal flaw in the plan.
It’d be fatal to try and stop them now.
causing or ending in death
a fatal accident/blow/illness
致命的事故／一击／疾病
a potentially fatal form of cancer
潜在致死型癌症
If she gets ill again it could prove fatal.
如果她再患病，就会有性命之忧。