Definitions of portentous:
  • adjective:   of momentous or ominous significance
    Example: "Such a portentous...monster raised all my curiosity- Herman Melville"
  • adjective:   of ominous significance
  • adjective:   puffed up with vanity

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Book See portentous used in context: 1 rhyme, 3 Shakespeare works, several books and articles.

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