IPA: //veɪnˈɡlɔːriəsli//
KK: /veɪnˈɡlɔːriəsli/
In a way that shows excessive pride in oneself or one's achievements.
He spoke vaingloriously about his accomplishments, making everyone else feel small.
Vaingloriously → It is formed from "vain" (from Old French *vain*, meaning empty or worthless) and "glory" (from Latin *gloria*, meaning fame or renown) combined with the adverbial suffix "-ously" (meaning in a manner of). The word describes acting in a manner that is excessively proud of one's achievements or appearance, often without justification.
Think of someone who feels 'empty' ('vain') yet seeks 'fame' ('glory') — when they act in this way, they do so 'in a manner of' ('-ously'). This helps you remember that vaingloriously means acting with excessive pride.