Synonyms and related words :
behindhand, careless, culpably negligent, delinquent, derelict, disregardful, inadvertent, inattentive, laissez-faire, lax, loose, neglecting, negligent, noninterfering, nonrestrictive, off-guard, overly permissive, permissive, procrastinating, regardless, relaxed, remiss, scamping, skimping, slack, slighting, slurring, uncircumspect, unguarded, unrigorous, unwary, unwatchful