OVERCONFIDENT

adj. 1 brash, arrogant, cocksure, cocky, brazen, hubristic, swaggering, audacious, overbearing, vainglorious, Colloq pushy It is harmful for a sportsman's morale to be overconfident of winning 2 heedless, foolhardy, thoughtless, short-sighted, hasty Rock-climbers should not be overconfident and rely entirely on their ropes