negligent
neg.li.gent \-j*nt\ aj [ME, fr. MF & L; MF, fr. L neglegent-, neglegens, prp. of negleg]ere 1: marked by or given to neglect 2: marked by a carelessly easy manner : NONCHALANT implies inattention to one's duty or business; NEGLECTFUL adds a more censorious implication of laziness or callousness; LAX implies want of strictness, severity, or precision; SLACK implies want of due or necessary diligence or care; REMISS implies blameworthy carelessness shown in slackness, forgetfulness, or neglect - neg.li.gent.ly av SYN syn NEGLECTFUL, LAX, SLACK, REMISS: NEGLIGENT
Webster's English Dictionary