Synonyms of overconfident

1 Syllable
brash, rash
2 Syllables
pushy, uppish, heedless, cockier, reckless, cocky
3 Syllables
snippety, impudent, boldfaced, presuming, presumptuous, hubristic, foolhardy, cocksure, careless, malapert
4 Syllables
smart-alecky, self-assured, overweening
5 Syllables
self-assertive, overfamiliar