Vain
/vˈeɪn/
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Definition
(adj) Overly proud of oneself, especially concerning appearance; having a high opinion of one's own accomplishments with slight reason.
Sentence Examples
All my haste was in vain.
We knocked at the door for five minutes, but in vain.
CEFR Practice Quiz
He made a ____ attempt to fix the broken machine, but it eventually became clear that a professional was needed today.