Definitions of nasty:

  • adjective:   offensive or even (of persons) malicious
    Example: "In a nasty mood"
  • adjective:   exasperatingly difficult to handle or circumvent
    Example: "A nasty problem"
  • adjective:   disgustingly dirty; filled or smeared with offensive matter
    Example: "A nasty pigsty of a room"
  • adjective:   characterized by obscenity
  • adjective:   thoroughly unpleasant
    Example: "Filthy (or foul or nasty or vile) weather we're having"