vainglorious – excessively proud of oneself or one's achievements
(Pronounced veyn-glaw-ree-uhs)
To remember the definition of the word vainglorious, use the following mnemonic:
The weather vane was glorious (vainglorious), it had an excessively proud person on the top.

Examples of vainglorious in a sentence
His vainglorious gloating was insufferable.
Her winning streak had made her vainglorious and over confident.
Their vainglorious celebration was a little excessive.