From Longman Dictionary of Contemporary Englishvaingloriousvain‧glo‧ri‧ous /veɪnˈɡlɔːriəs/ adjective literary PROUDtoo proud of your own abilities, importance etc
Examples from the Corpus
vainglorious• Thus, with each page, she becomes increasingly unattractive and vainglorious - brains and spirit corrupted by driving ambition.• In the fifth hotel the complimentary stationery carried the most vainglorious letterhead I have ever seen.• The bombastic, vainglorious Nivelle had virtually announced to the world his grandiose expectations, making the dreadful defeat doubly damaging. 