WordWeb Online

1. In a hideous manner
   "her face was monstrously disfigured after the accident"
   - hideously, horridly
    
2. In a terribly evil manner
   "the child was monstrously murdered"
   - heinously
    
3. In a grotesque manner
   "behind the house lay two nude figures monstrously bald, with deliberate knife-slashes marking their bodies"
   - grotesquely

See also: monstrous