IPA: //ˌveɪnˈɡlɔːr.i.əs//
KK: /ˈveɪnˌɡlɔːrɪəs/
Describing someone who is very proud of their own achievements and often shows off about them, sometimes in an annoying way.
His vainglorious attitude made it hard for others to work with him.
Vainglorious → It is formed from "vain" (from Old French *vain*, meaning empty or worthless) and "glorious" (from Latin *gloriosus*, meaning full of glory). The word "vainglorious" describes someone who is excessively proud of their own achievements or appearance, often in a way that is empty or without real merit.
Think of someone who is 'empty' ('vain') but still seeks 'glory' ('glorious') — that's why vainglorious means being overly proud of something that may not be substantial.