Adjective monstrous has 3 senses
  1. monstrous - abnormally large
    Antonyms:
    small, little (indirect, via large, big)
    Antonyms: small, little (indirect, via large, big)
  2. atrocious, flagitious, grievous, heinous, monstrous - shockingly brutal or cruel; "murder is an atrocious crime"; "a grievous offense against morality"; "a grievous crime"; "no excess was too monstrous for them to commit"
    Antonym: good (indirect, via evil)
  3. grotesque, monstrous, unnatural - distorted and unnatural in shape or size; abnormal and hideous; "tales of grotesque serpents eight fathoms long that churned the seas"; "twisted into monstrous shapes"
    Antonym: beautiful (indirect, via ugly)
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