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English definition of “nasty”

nasty

adjective uk   /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. B1 unkind: Don't be so nasty to your brother - he's four years younger than you! 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. rude or offensive: She said some quite nasty things about him. 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.
nastily
adverb uk   /ˈnɑː.stɪ.li/ us    /ˈnæs.tɪ-/
He laughed nastily (= unkindly) and walked away.
nastiness
noun [U] uk   /-nəs/ us  
(Definition of nasty from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of nasty?
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