overconfident

foolishly adventurous or bold the overconfident quarterback made some careless decisions that cost him the game Synonyms audacious, brash, daredevil, madcap, overbold, foolhardy, reckless, temerariousRelated Words adventuresome, adventurous, bold, daring, venturesome, venturous; brave, courageous, dauntless, doughty, fearless, gallant, greathearted, gutsy, hardy, heroic (also heroical), intrepid, lionhearted, manful, stalwart, stout, stouthearted, undauntable, undaunted, valiant, valorous; hotheaded; impetuous, imprudent, impulsive, incautious, rash; brainless, foolish, harebrained, scatterbrained; careless, heedless, thoughtless; hasty, headlong, precipitateNear Antonyms unadventurous, unambitious; fainthearted, fearful, mousy (or mousey), scary, shy, skittish, timid, timorous; calm, cool, levelheaded, sensible; alert, intelligent, quick-witted, sharp; chicken, chickenhearted, cowardly, craven, dastardly, lily-livered, pusillanimous, recreant, spineless, unheroic, yellowAntonyms careful, cautious, circumspect, guarded, heedful, prudent, safe, wary