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From The Collaborative International Dictionary of English v.0.48:
Ominous \Om"i*nous\, a. [L. ominosus, fr. omen. See Omen.] Of or pertaining to an omen or to omens; being or exhibiting an omen; significant; portentous; -- formerly used both in a favorable and unfavorable sense; now chiefly in the latter; foreboding or foreshowing evil; inauspicious; as, an ominous dread. [1913 Webster] He had a good ominous name to have made a peace. --Bacon. [1913 Webster] In the heathen worship of God, a sacrifice without a heart was accounted ominous. --South. [1913 Webster] -- Om"i*nous*ly, adv. -- Om"i*nous*ness, n. [1913 Webster]