GNU Collaborative International Dictionary of English

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1.       
   Nasty , a. [Compar. Nastier ; superl. Nastiest.] [For older nasky; cf. dial. Sw. naskug, nasket.]
    Offensively filthy; very dirty, foul, or defiled; disgusting; nauseous.
   1913 Webster
   Hence, loosely: Offensive; disagreeable; unpropitious; wet; drizzling; as, a nasty rain, day, sky.
   1913 Webster
   Characterized by obscenity; indecent; indelicate; gross; filthy.
   1913 Webster
   Vicious; offensively ill-tempered; insultingly mean; spiteful; as, a nasty disposition.
   PJC
   Difficult to deal with; troublesome; as, he fell of his bike and got a nasty bruise on his knee. [slang] 
   PJC
   Syn. -- Nasty, Filthy, Foul, Dirty. Anything nasty is usually wet or damp as well as filthy or dirty, and disgusts by its stickiness or odor; but filthy and foul imply that a thing is filled or covered with offensive matter, while dirty describes it as defiled or sullied with dirt of any kind; as, filthy clothing, foul vapors, etc.
   1913 Webster