monstrous

(s) abnormally large
(s) 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
atrocious, flagitious, grievous,
(s) 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
grotesque,

atrocious flagitious grievous grotesque

monstrously