fatal adj.

1 causing death

VERBS be, prove

ADV. near He has not driven since his near fatal crash earlier this year. | always, invariably, universally | often, sometimes, usually | rarely | potentially The disease is potentially fatal.

PREP. for This kind of accident is almost always fatal for the pilot. | to a chemical which is invariably fatal to small mammals

2 causing serious trouble

VERBS be, prove

ADV. absolutely | ultimately Her disregard of this advice was ultimately fatal.

PREP. to Tax increases have proved fatal to the nation's business community.