The word that comes to mind over here is ‘vainglorious.’

Synonyms: assured, biggety (or biggity) [Southern & Midland], bigheaded, complacent, consequential, egoistic (also egoistical), egotistic (or egotistical), important, overweening, pompous, prideful, proud, self-conceited, self-important, self-opinionated, self-satisfied, smug, stuck-up, swellheaded, vain, conceited