vaingloriousEnglishOxford Dictionary of Englishvainglorious /veɪnˈɡlɔːriəs / ▸ adjective literary excessively proud of oneself or one's achievements; overly vain: this vainglorious boast of personal infallibility. – DERIVATIVES vaingloriously /veɪnˈɡlɔːriəsli / adverb vaingloriousness /veɪnˈɡlɔːriəsnəs / noun