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[om-uh-nuh s] /ˈɒm ə nəs/
portending evil or harm; foreboding; threatening; inauspicious:
an ominous bank of dark clouds.
indicating the nature of a future event, for good or evil; having the significance of an omen; being a portent:
Some of these events were immediately ominous, while others only later revealed themselves as such.
Origin of ominous
1580-90; < Latin ōminōsus portentous, equivalent to ōmin- (stem of ōmen) omen + -ōsus -ous
Related forms
ominously, adverb
ominousness, noun
unominous, adjective
unominously, adverb
unominousness, noun
Ominous, portentous, threatening, menacing, fateful are adjectives describing that which forebodes a serious, significant, and often harmful outcome. Ominous, derived from omen “a predictor of outcomes,” usually suggests evil or damaging eventualities: ominous storm clouds; an ominous silence. Portentous, although it may suggest evil results, often stresses a momentous or very important outcome: a portentous moment in history; a portentous escalation of hostilities. Threatening may suggest calamity or great harm but sometimes mere unpleasantness: a threatening rumble from the volcano; A threatening look from his brother caused him to quickly change the subject. Menacing always suggests serious damage as an outcome: a disease menacing the entire population; He advanced with a menacing swagger. Fateful most often stresses the great or decisive importance of what it describes: a fateful encounter between two future leaders; a fateful day that changed our world. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for ominousness
Historical Examples
  • Despite the ominousness of the times, Mercer continued with the daily routine, the minutiae of which filled his journal.

  • That face once seen could never be forgotten, and he was overcome by the ominousness of the meeting.

    The False Chevalier William Douw Lighthall
  • To him, as to his mother, the circumstance had at once conveyed a suggestion of ominousness, a hint of possible evil tidings.

  • Too ominous, Mr. Moore thought: let ominousness be kept for one's attitude towards crime.

    East Angels Constance Fenimore Woolson
British Dictionary definitions for ominousness


foreboding evil
serving as or having significance as an omen
Derived Forms
ominously, adverb
ominousness, noun
Word Origin
C16: from Latin ōminōsus, from omen
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ominousness



1580s, from Latin ominosus "full of foreboding," from omen (genitive ominis) "foreboding" (see omen). Related: Ominousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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