Something nasty is filthy, foul, dirty, or awful. Nasty isn't a word for anything nice.

The main meaning of nasty is for things that are unpleasant and very gross. If someone throws up in class, at least one student will probably say, "That's nasty!" The smell of a bathroom is nasty. A song full of dirty words is nasty in a different way. Nasty can also mean "extremely." In football, a vicious hit can be called a nasty hit. A mean person is a nasty person too.

Definitions of nasty
  1. adjective
    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”
    synonyms: awful
    dirty, filthy, lousy
    vile; despicable
    very unpleasant or offensive
    hateful, mean
    characterized by malice
    disagreeable to the senses, to the mind, or feelings
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    pleasant or pleasing or agreeable in nature or appearance
    agreeable or pleasing
    (of persons) having pleasing manners or behavior
    affording pleasure; being in harmony with your taste or likings
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  2. adjective
    disgustingly dirty; filled or smeared with offensive matter
    “a nasty pigsty of a room”
    synonyms: filthy, foul
    dirty, soiled, unclean
    soiled or likely to soil with dirt or grime
  3. adjective
    exasperatingly difficult to handle or circumvent
    “a nasty problem”
    synonyms: tight
    difficult, hard
    not easy; requiring great physical or mental effort to accomplish or comprehend or endure
  4. adjective
    characterized by obscenity
    synonyms: cruddy, filthy, foul, smutty
    (of behavior or especially language) characterized by obscenity or indecency
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