Synonyms and related words :
arbitrary, automatic, capricious, careless, casual, culpably negligent, derelict, disregardant, disregardful, distracted, distrait, feckless, gut, heedless, ill-advised, ill-considered, ill-devised, inattentive, inconsiderate, incurious, indeliberate, indifferent, inobservant, involuntary, laissez-faire, lax, loose, neglectful, neglecting, negligent, noninterfering, nonrestrictive, off-guard, overly permissive, permissive, procrastinating, reasonless, reflex, reflexive, regardless, relaxed, remiss, scamping, skimping, slack, slighting, slurring, snap, spontaneous, thoughtless, unadvised, uncalculated, uncalculating, uncaring, uncircumspect, unconscious, unconsidered, undeliberate, undeliberated, undesigned, undevised, unguarded, unheedful, unheeding, unintended, unintentional, unmarking, unmeditated, unmindful, unnoticing, unnoting, unobservant, unobserving, unplanned, unpremeditated, unpurposed, unreasoning, unreflecting, unreflective, unremarking, unrigorous, unstudied, unthinking, unthought, unthoughtful, unwary, unwatchful, unwilled, wrecking