parvenu

nouns

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

adjectives

characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position
nouveau-riche, parvenu, parvenue, upstart
of or characteristic of a parvenu
parvenu, parvenue