Source : WordNet®

nouveau-riche
     adj : characteristic of someone who has risen economically or
           socially but lacks the social skills appropriate for
           this new position [syn: {parvenu}, {parvenue}, {upstart(a)}]
     n : a person who has suddenly risen to a higher economic status
         but has not gained social acceptance of others in that
         class [syn: {upstart}, {parvenu}, {arriviste}]