nasty in WordNet English dictionary

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?"- Ezra Pound
   nasty  awful 
   
2. characterized by obscenity
   "had a filthy mouth"; "foul language"; "smutty jokes"
   cruddy  filthy  foul  nasty  smutty 
   
3. disgustingly dirty; filled or smeared with offensive matter
   "as filthy as a pigsty"; "a foul pond"; "a nasty pigsty of a room"
   filthy  foul  nasty 
   
4. exasperatingly difficult to handle or circumvent
   "a nasty problem"; "a good man to have on your side in a tight situation"
   nasty  tight