thoughtless

I adjective absent-minded, abstracted, blank, blockish, careless, casual, dazed, disregardful, distracted, distrait, dull, flighty, foolhardy, giddy, harebrained, headlong, heedless, ill-advised, improvident, imprudens, imprudent, impulsive, inadvertent, inane, inattentive, incogitant, inconsiderate, inconsultus, indelicate, indifferent, indiscreet, insensate, irrational, irresponsible, neglectful, neglegens, negligent, precipitate, rash, reckless, regardless, remiss, scatterbrained, selfish, stupid, tactless, unaccommodating, unconcerned, unmindful, unobliging, unobservant, unreasoning, unreflecting, unreflective, unthinking, unthoughtful, unwatchful. vacant, vacuous, without consideration II index blind (not discerning), careless, casual, cursory, derelict (negligent), fatuous, heedless, hot-blooded, ill-judged, impolitic, improvident, imprudent, impulsive (rash), inadvertent, injudicious, irrational, irresponsible, lax, misadvised, negligent, oblivious, perfunctory, perverse, precipitate, reckless, remiss, slipshod, unpremeditated, unwitting, vacuous