Definition of nasty adjective from the Oxford Advanced Learner's Dictionary

     

    nasty

     adjective
    adjective
    BrE BrE//ˈnɑːsti//
     
    ; NAmE NAmE//ˈnæsti//
     
    (nastier, nastiest) Describing unpleasant traits
     
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  1. 1very bad or unpleasant a nasty accident The news gave me a nasty shock. I had a nasty feeling that he would follow me. He had a nasty moment when he thought he'd lost his passport. This coffee has a nasty taste. Don't buy that coat—it looks cheap and nasty.
  2. 2unkind; unpleasant synonym mean to make nasty remarks about somebody the nastier side of her character to have a nasty temper Don't be so nasty to your brother. That was a nasty little trick. Life has a nasty habit of repeating itself. See related entries: Describing unpleasant traits
  3. 3dangerous or serious a nasty bend (= dangerous for cars going fast) a nasty injury
  4. 4offensive; in bad taste to have a nasty mind nasty jokes see also video nasty
  5. Word Origin late Middle English: of unknown origin.Extra examples He’s a thoroughly nasty piece of work. Kevin seems to enjoy being nasty to his sisters. She was nasty about everyone. Things could turn nasty if we’re not careful. Things could turn nasty= dangerous if we’re not careful. a nasty little man a room full of cheap and nasty ornaments gang warfare of a thoroughly nasty kind Don’t buy that coat—it looks cheap and nasty. He had a nasty accident. He had a nasty moment when he thought he’d lost his passport. He has a nasty temper. She’s always making nasty remarks about people. This coffee tastes nasty.Idioms
    1. 1to become threatening and violent You'd better do what he says or he'll turn nasty. After the game, things turned nasty and there were fights in the streets.
    2. 2to become bad or unpleasant It looks as though the weather is going to turn nasty again.
    leave a bad/nasty taste in the mouth
     
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    (of events or experiences) to make you feel disgusted or ashamed afterwards
    (British English, informal) a person who is unpleasant, unkind or dishonest Don’t trust him; he’s a nasty piece of work.
See the Oxford Advanced American Dictionary entry: nasty