negligent

synonyms negligent , neglectful , lax , slack , remiss mean culpably careless or indicative of such carelessness. negligent implies inattention to one's duty or business <negligent about writing a note of thanks>. neglectful adds a more disapproving implication of laziness or deliberate inattention <a society callously neglectful of the poor>. lax implies a blameworthy lack of strictness, severity, or precision <a reporter lax about accurate quotation>. slack implies want of due or necessary diligence or care <slack workmanship>. remiss implies blameworthy carelessness shown in slackness, forgetfulness, or neglect <had been remiss in their familial duties>.