Synonyms: uppity, overweening
Definition: presumptuously arrogant
Usage: had a witty but overweening manner; no idea how overweening he would be- S.V.Benet; getting a little uppity and needed to be slapped down- NY Times
Similar words: immodest
Definition: having or showing an exaggerated opinion of your importance, ability, etc
Usage: brash immodest boasting