monstrous

abnormally large

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”

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”