parvenu

(noun) a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class. Synonyms: upstart, nouveau-riche, arriviste.

(adj) characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position. Synonyms: nouveau-riche, parvenue, upstart(prenominal).

(adj) of or characteristic of a parvenu. Synonyms: parvenue.