Synonyms for monstrous

Adjective

1. monstrous, large (vs. small), big (vs. little)

usage: abnormally large

2. atrocious, flagitious, grievous, heinous, monstrous, evil (vs. good), wicked

usage: 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"

3. grotesque, monstrous, unnatural, ugly (vs. beautiful)

usage: 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"