lost cause Meaning, definition in Cambridge English Dictionary
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Meaning of "lost cause" - English Dictionary

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lost causenoun [C usually singular]

uk   us  
someone or something that has no chance of succeeding: I used to try to get him to do some exercise but then decided he was a lost cause.
Translations of “lost cause”
in Chinese (Traditional) 沒有希望的人(或事)…
in Chinese (Simplified) 没有希望的人(或事)…
(Definition of lost cause from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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