Etymology
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ominous (adj.)

"conveying an omen, significant," 1580s, from Latin ominosus "full of foreboding," from omen (genitive ominis) "foreboding" (see omen (n.)). Especially (and now exclusively) "of ill omen, giving indication of coming evil." Related: Ominousness.

Origin and meaning of ominous

updated on October 13, 2021

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Definitions of ominous from WordNet

ominous (adj.)
threatening or foreshadowing evil or tragic developments;
ominous rumblings of discontent
Synonyms: baleful / forbidding / menacing / minacious / minatory / sinister / threatening
ominous (adj.)
presaging ill fortune; "my words with inauspicious thunderings shook heaven"- P.B.Shelley;
a dead and ominous silence prevailed
Synonyms: ill / inauspicious
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.