a person who has suddenly acquired wealth or power, esp. one who is not fully accepted socially by the class associated with the higher position; upstart
adjective
being a parvenu
like or characteristic of a parvenu
See parvenu in American Heritage Dictionary 4
(pärˈvə-no͞oˌ, -nyo͞oˌ)
noun
A person who has suddenly risen to a higher social and economic class and has not yet gained social acceptance by others in that class.