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English definition of “a tough/hard nut”

a tough/hard nut

someone who is very unpleasant and difficult to deal with: As a teenager, Jack was a real hard nut, always getting into fights.Unpleasant people in generalUnpleasant men
(Definition of a tough/hard nut from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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Translations of “a tough/hard nut”

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