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Adjective: monstrous  món-strus
  1. Abnormally large
  2. Shockingly brutal or cruel
    "no excess was too monstrous for them to commit";
    - atrocious, flagitious, grievous
  3. Distorted and unnatural in shape or size; abnormal and hideous
    "twisted into monstrous shapes";
    - grotesque

See also: big, evil, large, ugly, unbeautiful

Encyclopedia: Monstrous