Hubristic, originally uploaded by zannnielim.

Hubristic's definition: self-assured, full of oneself

Part of Speech: adjective
Synonyms: arrogant, brash, bumptious, certain, conceited, confident, egotistical, hotdogging, hotshot, know-it-all, lordly, nervy, overconfident, overweening, positive, presumptuous, self-confident, smart aleck, smart guy, smarty, smarty pants, sure, swaggering, swollen-headed, vain, wise guy

Antonyms: humble, modest, uncertain, unself-confident, unsure