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English definition of “a hard/tough nut to crack”

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a hard/tough nut to crack

a problem that is very difficult to solve or a person who is very difficult to understand
Translations of “a hard/tough nut to crack”
in Chinese (Traditional) 棘手的問題, 難以理喻的怪人…
in Chinese (Simplified) 棘手的问题, 难以理喻的怪人…
(Definition of a hard/tough nut to crack from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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