Same word as over-familiar:

arrogant, audacious, bold, cheeky, conceited, confident, contumelious, egotistic, foolhardy, forward, fresh, insolent, overconfident, overfamiliar, overweening, pompous, presuming, pretentious, pushy, rash, rude, self-assertive, self-assured, self-satisfied, smug, supercilious, uppity