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English definition of “vain”

vain

adjective     /veɪn/
in vain without any success: I tried in vain to start a conversation.Failing and doing badlyUseless and futileUnsuccessful (people and things)
vain attempt/effort/hope an attempt/effort, etc that does not have the result you wantUseless and futileUnsuccessful (people and things)
too interested in your own appearance and thinking you are very attractiveShowing arrogance and conceitConfidence and self-assuranceBoasting
vainly adverb
(Definition of vain adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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