'nouveau-riche' definitions:

adjective

Characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position [syn: nouveau-riche, parvenu, parvenue, upstart(a)]

noun

A person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class [syn: upstart, parvenu, nouveau-riche, arriviste]