WordWeb Online

1. Offensive or even (of persons) malicious
   "in a nasty mood"; "a nasty accident"; "a nasty shock"; "a nasty smell"; "a nasty trick to pull"; "Will he say nasty things at my funeral?"
   - awful
    
2. Exasperatingly difficult to handle or circumvent
   "a nasty problem"
   - tight
    
3. Characterized by obscenity
   - cruddy, filthy, foul, smutty
    
4. Disgustingly dirty; filled or smeared with offensive matter
   "a nasty pigsty of a room"
   - filthy, foul

Derived forms: nastiest, nastier

See also: difficult, dirty, filthy, grotty [Brit], hard, hateful, lousy, mean, nastily, nastiness, soiled, unclean, unpleasant

Antonym: nice

Encyclopedia: Nasty Nasty, Hertfordshire