Definition for Portentous:

• Ominous; foreshowing ill; wonderful, in an ill sense.

Synonyms for Portentous:

• adj.

  •dangerous (adjective)
  • fatal,
  • terrible,
  • parlous,
  • bad,
  • urgent,
  • menacing,
  • pressing,
  • serious,
  • Jeopardous,
  • formidable,
  • critical,
  • perilous.
  •dire (adjective)
  • terrific,
  • fearful,
  • gloomy,
  • disastrous,
  • black,
  • horrid,
  • dreadful,
  • redoubtable,
  • shocking,
  • unfortunate,
  • horrible,
  • frightful,
  • calamitous,
  • awful.
  •fateful (adjective)
  • decisive,
  • Doomful,
  • inauspicious,
  • direful.
  •frightful/frightening (adjective)
  • awesome,
  • intimidating,
  • ghastly,
  • dread.
  •fustian (adjective)
  • pretentious,
  • ostentatious.
  •hellfire (adjective)
  • fire-and-brimstone.
  •ominous (adjective)
  • minatory,
  • unpropitious,
  • dark,
  • baleful,
  • clouded,
  • lowering.
  •portentous (adjective)
  • ill-fated,
  • fated,
  • suggestive,
  • important,
  • impending,
  • haunting,
  • Augural,
  • destined,
  • exhilarating,
  • thrilling,
  • intriguing,
  • alarming,
  • inspiring.
  •sinister (adjective)
  • adverse,
  • unfavorable,
  • evil.
  •threatening (adjective)
  • minacious,
  • comminatory.
  •unusual (adjective)
  • unusual,
  • rare.

• n.

  •
  • grave.
  •portentous (noun)
  • prophetical.

• Other synonyms:

  •
  • consultative,
  • deterrent,
  • apocalyptic,
  • hellfire,
  • apocalyptical,
  • Consulting,
  • cautionary.
  •
  • baneful.
  •
  • unlucky.
  •sinister
  • monitory.

Antonyms for Portentous:

• adj.

  • Other antonyms:
    customary, prosperous, enervating, tedious, draining, beggarly, weary, vulgar, unpretentious, monotonous, boring, humble, uninspired, commonplace, Jading, debilitating, unimportant, benign, wearing, tiring, typical, base, wearying, unremarkable, ordinary, inferior, undignified, usual, uninteresting, normal, unexceptional, auspicious, unprophetic, demoralizing, golden, despicable, unimpressive, disheartening, unthreatening, common, paltry, wearisome, mundane, enfeebling, lowly, insignificant, dispiriting, uninspiring, contemptible, discouraging, mean, exhausting, dull.

• Other antonyms:

  • n.
    nonsignificant.