vaingloriousEnglishOxford New American Dictionaryvainglorious /ˌvānˈɡlôrēəs, ˌveɪnˈɡlɔriəs / ▸ adjective literary excessively proud of oneself or one's achievements; overly vain: this vainglorious boast of personal infallibility. – DERIVATIVES vaingloriously /ˌvānˈɡlôrēəslē, ˌveɪnˈɡlɔriəsli / adverb,vaingloriousness /ˌvānˈɡlôrēəsnəs, ˌveɪnˈɡlɔriəsnəs / noun