Careless synonyms such as effortless, absent-minded, artless, and casual. Careless is an adjective, and its antonyms are careful, attentive, meticulous, and judicious. Additionally, here are 80 synonyms, related words, and verbs for careless.
absent-minded, amateurish, couldn't care less, cursory, disorganized, erroneous, error-ridden, foolhardy, forgetful, frivolous about, hare-brained, hasty, heedless, heedless of, hit-or-miss, hurried, ill-advised, ill-considered, ill-thought-out, impetuous, imprecise, improvident about, inaccurate, inadvertent, inattentive, incautious, incorrect, indifferent to, indiscreet, inexact, insensitive, irresponsible, lax, messy in, mindless of, misguided, negligent, negligent in, oblivious to, perfunctory, rash, reckless, reckless about, remiss, remiss in, scatterbrained, scrappy, shoddy, sketchy, slack, slap-happy, slapdash, slapdash about, slipshod, slipshod about, sloppy, sloppy in, slovenly, spur-of-the-moment, thoughtless, thrown together, unconcerned about, unconsidered, unguarded, unthinking, unwise, wild, and wrong.
artless, casual, couldn't-care-less, effortless, informal, insouciant, languid, leisurely, nonchalant, unconcerned, and unstudied.