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From Middle English monstrous, from Old French monstrueuse, monstrüos, from Latin mōnstrōsus. Compare monstruous.



monstrous (comparative more monstrous, superlative most monstrous)

  1. Hideous or frightful.
  2. Enormously large.
    a monstrous height
    • 1901 December 20, “The Ringing of Plants”, in The Agricultural Journal and Mining Record[1], volume 4, number 21, page 663:
      Possibly monster pumpkins may become still more monstrous by the shoots being ringed, and so may other vegetables and fruits where quality is of less importance than mere size.
  3. Freakish or grotesque.
  4. Of, or relating to a mythical monster; full of monsters.
  5. (obsolete) Marvellous; exceedingly strange; fantastical.
    • 1887, H. Rider Haggard, She: A History of Adventure[2]:
      The whole story was monstrous, and only worthy of the superstitious days in which it was written.



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Middle English[edit]



  1. Alternative form of monstruous