upstart

nouns

an arrogant or presumptuous person
upstart
is a type of (narrower)
a person who is not pleasant or agreeable
disagreeable person, unpleasant person
a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class
arriviste, nouveau-riche, parvenu, upstart
a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest upright
kip, upstart

adjectives

characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position
nouveau-riche, parvenu, parvenue, upstart