unlucky vs ill-omened

unlucky and ill-omened both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unlucky	No	Yes	No	No
ill-omened	No	Yes	No	No

As adjectives, unlucky and ill-omened are synonyms defined as:

Other synonyms of unlucky include doomed, ill-fated, ill-starred.

unlucky (adjective)	ill-omened (adjective)
having or bringing misfortune	marked by or promising bad fortune
marked by or promising bad fortune