vainEnglish → FrenchEnglish–French Dictionaryvain[veɪn] 1. adjective 1) (conceited) vaniteux/-euse, vain (after n) to be vain about something — tirer vanité de quelque chose 2) (futile) [attempt, hope] vain (before n); [show] futile2. in vain adverbial phrase en vain