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]