ETYM Latin ominosus, from omen. Related to Omen.
1. Foreboding or foreshowing evil; inauspicious.
2. Of or pertaining to an omen or to omens; being or exhibiting an omen; significant; portentous.
alarming · baleful · forbidding · ill · inauspicious · menacing · minacious · minatory · sinister · threatening · unpropitious