The Collaborative International Dictionary of English v.0.48:
Vainglorious \Vain`glo"ri*ous\, a. Feeling or indicating vainglory; elated by vanity; boastful. "Arrogant and vainglorious expression." --Sir M. Hale. -- Vain`glo"ri*ous*ly, adv. -- Vain`glo"ri*ous*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
vainglorious adj 1: feeling self-importance; "too big for his britches"; "had a swelled head"; "he was swelled with pride" [syn: big, swelled, vainglorious]