parvenu

Adjective

• of or characteristic of a parvenu

• characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position

Noun

• a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class

Related words

• Synonyms: 
  parvenue , nouveau-riche , upstart(a) , upstart , arriviste