Definition of “be (of) no use” - English Dictionary

british dictionary

“be (of) no use” in British English

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be (of) no use

B2 to not be useful, helpful, or possible:

His advice turned out to be no use at all.
There is no use (in) arguing any more.
It is no use trying (= there is no purpose in trying) to escape - no one ever gets out of here.
It's no use (= I cannot succeed) - I just can't get this lid off.

(Definition of “be (of) no use” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)