The Collaborative International Dictionary of English v.0.48:
Unimportant \Unimportant\ See important.WordNet (r) 3.0 (2006):
unimportant adj 1: not important; "a relatively unimportant feature of the system"; "the question seems unimportant" [ant: important, of import] 2: devoid of importance, meaning, or force [syn: insignificant, unimportant] [ant: important, significant]