34 synonyms for cocky such as boastful, arrogant, and blustering. Cocky is an adjective, and its antonyms are modest and diffident.
Arrogant, blustering, boastful, bold, brash, cocksure, conceited, disdainful, egotistical, forward, haughty, high and mighty, hubristic, insolent, lofty, lordly, opinionated, overconfident, overweening, patronizing, pompous, presumptuous, proud, self-assertive, self-important, smug, supercilious, swollen-headed, throwing one's weight about, throwing one's weight around, uppish, vain, and vainglorious.