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English definition of “vain”

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vain

adjective [-er/-est only]  /veɪn/ us  

vain adjective [-er/-est only] (UNSUCCESSFUL)

unsuccessful or useless; failing to achieve a purpose: a vain attempt to avoid responsibility Employers clearly hoped that the workers would stay longer, but their efforts were largely in vain (= unsuccessful).

vain adjective [-er/-est only] (SELFISH)

too proud of yourself, esp. in your appearance or achievements
(Definition of vain from the Cambridge Academic Content Dictionary © Cambridge University Press)
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