Usually means: Ominously significant or indicative; foreboding.
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We found 25 dictionaries that define the word portentous:

General (23 matching dictionaries)
  1. portentous: Longman Dictionary of Contemporary English
  2. portentous: Merriam-Webster
  3. portentous: Oxford Learner's Dictionaries
  4. portentous: American Heritage Dictionary of the English Language
  5. portentous: Collins English Dictionary
  6. portentous: Vocabulary.com
  7. Portentous, portentous: Wordnik
  8. portentous: Cambridge Advanced Learner's Dictionary
  9. portentous: Wiktionary
  10. portentous: Webster's New World College Dictionary, 4th Ed.
  11. portentous: The Wordsmyth English Dictionary-Thesaurus
  12. portentous: Infoplease Dictionary
  13. Portentous, portentous: Dictionary.com
  14. Portentous: Online Plain Text English Dictionary
  15. portentous: Webster's Revised Unabridged, 1913 Edition
  16. portentous: Rhymezone
  17. Portentous: AllWords.com Multi-Lingual Dictionary
  18. portentous: Webster's 1828 Dictionary
  19. portentous: FreeDictionary.org
  20. portentous: Mnemonic Dictionary
  21. portentous: TheFreeDictionary.com

Business (1 matching dictionary)
  1. portentous: Legal dictionary

Computing (1 matching dictionary)
  1. portentous: Encyclopedia

(Note: See portentously as well.)

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Definitions from Wiktionary (
)
American English Definition British English Definition
▸ adjective:  Of momentous or ominous significance.
▸ adjective:  Ominously prophetic.
▸ adjective:  Puffed up with vanity.

Similar:
significant, important, prodigious, fateful, foreboding, grandiloquent, pompous, pretentious, overblown, prophetical, more...

Opposite:
unimportant, insignificant, trivial, paltry

Colors:
    dark purple,     midnight blue,     deep red,     black,     blood red, more...



▸ Words similar to portentous

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▸ Rhymes of portentous

▸ Invented words related to portentous

Similar:
significant, important, prodigious, fateful, foreboding, grandiloquent, pompous, pretentious, overblown, prophetical, more...

Opposite:
unimportant, insignificant, trivial, paltry

Colors:
    dark purple,     midnight blue,     deep red,     black,     blood red, more...



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