monstrous

Adjective

• 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
    

• 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
    

• abnormally large

Related words

• Synonyms: 
  grotesque , atrocious , flagitious , grievous