Parvenu

[pahr-vuh-noo, -nyoo, pahr-vuh-noo, -nyoo] /ˈpɑr vəˌnu, -ˌnyu, ˌpɑr vəˈnu, -ˈnyu/

noun
1.
a person who has recently or suddenly acquired wealth, importance, position, or the like, but has not yet developed the conventionally appropriate manners, dress, surroundings, etc.
adjective
2.
being or resembling a parvenu.
3.
characteristic of a parvenu.
/ˈpɑːvəˌnjuː/
noun
1.
a person, esp a man, who, having risen socially or economically, is considered to be an upstart or to lack the appropriate refinement for his or her new position
adjective
2.
of or characteristic of a parvenu
adjective

pertaining to a recent rise in wealth or position
noun

a person who has suddenly attained wealth or position but has not yet gained acceptance in the upper class; also, an upstart who has not yet gained the manner associated with this new position
Word Origin

Latin per ‘through’ + venire ‘to come’
n.

“upstart,” 1802, from French parvenu, “said of an obscure person who has made a great fortune” (Littré); noun use of past participle of parvenir “to arrive” (12c.), from Latin pervenire “to come up, arrive, attain,” from per- “through” (see per (prep.)) + venire “to come” (see venue). As an adjective from 1828.