reckless

1 having or showing a lack of concern for the consequences of one's actions <the reckless skiers were making everyone nervous by schussing down the mountainside at lightning speed> Synonyms daredevil, devil-may-care, foolhardy, harum-scarum, hell-for-leather, irresponsible, kamikaze Related Words adventurous, audacious, bold, daring, venturesome; hasty, headlong, hotheaded, impetuous, precipitate, rash, wild; blithe, carefree, happy-go-lucky, madcap, slaphappy; nonchalant, unconcerned, unworried; careless, freewheeling, heedless, inattentive, incautious, mindless, regardless, unheeding, unmindful; feckless, inconsiderate, thoughtless, unthinking Near Antonyms careful, cautious, circumspect, heedful; overcareful, overcautious, timid Antonyms responsible

2 foolishly adventurous or bold <the calamitous accident was caused by a reckless driver who cut off the semitrailer> Synonyms audacious, brash, daredevil, madcap, overbold, overconfident, foolhardy, 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