1. Characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position
   "Their parvenue neighbours threw lavish but tacky parties";
   - nouveau-riche, parvenu, upstart
    
2. Of or characteristic of a parvenu
   "Her parvenue manners betrayed her lack of aristocratic upbringing";
   - parvenu

See also: new, pretentious