portentous

[pawr-ten-tuhs, pohr-]
adjective
1.
of the nature of a portent; momentous.
2.
ominously significant or indicative: a portentous defeat.
3.
marvelous; amazing; prodigious.

Origin:
1530–40; < Latin portentōsus. See portent, -ous

portentously, adverb
portentousness, noun
nonportentous, adjective
nonportentously, adverb
nonportentousness, noun
unportentous, adjective
unportentously, adverb
unportentousness, noun

portentous, pretentious.


1, 2. See ominous. 2. unpropitious, inauspicious, threatening.
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World English Dictionary
portentous (pɔːˈtɛntəs)
 
adj
1.  of momentous or ominous significance
2.  miraculous, amazing, or awe-inspiring; prodigious
3.  self-important or pompous
 
por'tentously
 
adv
 
por'tentousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

portentous
1530s, from L. portentosus, from portentem (see portend).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As an explanation for such a portentous mystery, this has to be too mundane.
The conspiracy theory assigns portentous, sinister meanings to what are most
  likely innocuous, insignificant events.
If in fact we are alone, it means that we're not only the heirs to the cosmos,
  but its guardians; which is a portentous thought.
No movie or group of movies should be forced to bear the weight of such
  portentous moral analyses.
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