(pronounced vayn-GLOR-ee-ehs)

As the less-often used word “vainglory” means unwarranted or pretentious arrogance, you can surmise that vainglorious means boastful and vain.

Example: Though he was certain he was a shoe-in to lead the firm’s new retail development division, Mickey’s lack of self-awareness and tendency toward vainglorious behavior made him the least likely candidate to be chosen.