aggressively self-confident
biggety
bumptious
chesty
chichi
cocky
conceited
flamboyant
immodest
know-it-all
obtrusive
ostentatious
overwise
peacockish
perk
perky
pert
pretentious
puffed up
self-conceited
self-opinionated
smart-alecky
splashy
strutting
stuck-up
swaggering
swank
swashbucklering
swashbuckling
swashing
swelled-headed