Meaning of “no good” in the English Dictionary

british dictionary

"no good" in British English

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(Definition of “no good” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"no good" in American English

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no good

also not any/much good

not very useful or effective:

It's no good trying to change his beliefs.
I'm not much good at explaining math problems.

(Definition of “no good” from the Cambridge Academic Content Dictionary © Cambridge University Press)