noun

1. A fatality; an event that leads to death.

2. A fatal error; a failure that causes a program to terminate.

adjective

1. Proceeding from, or appointed by, fate or destiny.

2. Foreboding death or great disaster.

3. Causing death or destruction.

   “a fatal wound; a fatal disease; that fatal day; a fatal mistake”

Synonyms: calamitous, deadly, destructive, mortal, terminal, inevitable, necessary