Adjective
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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"
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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"
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abnormally large