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monstrous

adjective

  1. abnormally or prodigiously large; huge; enormous
  2. very unnatural or abnormal in shape, type, or character
  3. having the character or appearance of a monster
  4. horrible; hideous; shocking
  5. hideously wrong or evil; atrocious

adverb

Chiefly Dial. very; extremely

Related Forms:

See monstrous in American Heritage Dictionary 4

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