Ostentatious

/ˌɑːstɛnˈteɪʃəs/ adjective medium

Showing off wealth or achievement in a way meant to impress or draw attention.

He drove the most ostentatious car in the parking lot, just to make sure everyone noticed.

Memory Trick

Contains 'ostent-,' related to Latin 'ostendere,' to show — ostentatious behavior is all about showing off.