- Compulsory - Inescapable - Inevitable - Necessary - Not avoidable; incapable of being shunned or
prevented; inevitable; necessary; as, unavoidable troubles. - Not voidable; incapable of being made null or void.
- Inevitable - Incapable of being recalled or revoked; unchangeable;
irreversible; unalterable; as, an irrevocable promise or decree;
irrevocable fate.