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English definition of “nasty”

nasty

adjective     /ˈnɑː.sti/ US  /ˈnæs.ti/
B1 bad or very unpleasant: a nasty shock/surprise There's a nasty smell in here. He had a nasty cut above the eye. She has a nasty habit of picking on people in meetings.Serious and unpleasantNot attractive to look atInformal words for bad B1 unkind: Don't be so nasty to your brother - he's four years younger than you!Unkind, cruel and unfeelingViolent or aggressiveTreating people or animals badlyInsults and abuse B2 dangerous or violent: In an emergency you could get out through a window, but it would be a nasty drop. The situation could turn (= become) nasty at any moment.Dangers and threats rude or offensive: She said some quite nasty things about him.Serious and unpleasantNot attractive to look atInformal words for bad have a nasty feeling to think that something bad is likely to happen or to be true: I've got a nasty feeling that I forgot to tell Joe I couldn't come.Predicting things and intuition nastily     /ˈnɑː.stɪ.li/ US  /ˈnæs.tɪ-/ adverb He laughed nastily (= unkindly) and walked away.Unkind, cruel and unfeelingViolent or aggressiveTreating people or animals badlyInsults and abuse nastiness     /-nəs/ noun [U] Serious and unpleasantNot attractive to look atInformal words for bad
(Definition of nasty adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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