gauche

Vegas wedding chapel: gauche venue.

gōsh

(French, ‘left,’ as in left-handed, or clumsy)

A gauche person lacks grace, social experience, and tact. He or she may also be crude, awkward, and uncomfortable in social situations.

Things can also be gauche: gauche behaviors, gauche buildings, gauche events.

Would it be gauche to ask the countess her age?