Fatal

1. a. Causing death or destruction; deadly; mortal; destructive; calamitous; as, a fatal wound; a fatal disease; a fatal day; a fatal error.
2. a. Proceeding from, or appointed by, fate or destiny; necessary; inevitable.
3. a. Foreboding death or great disaster.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.