01 a. Offensively filthy; very dirty, foul, or defiled; disgusting; nauseous.
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1.
Offensively filthy; very dirty, foul, or defiled; disgusting; nauseous.
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2.
Hence, loosely: Offensive; disagreeable; unpropitious; wet; drizzling; as, a nasty rain, day, sky.
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3.
Characterized by obscenity; indecent; indelicate; gross; filthy.
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4.
Vicious; offensively ill-tempered; insultingly mean; spiteful; as, a nasty disposition.
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5.
Difficult to deal with; troublesome; as, he fell of his bike and got a nasty bruise on his knee.[slang]
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.