inattentive, neglectful -- (not showing due care or attention; "inattentive students"; "an inattentive babysitter"; "neglectful parents")
derelict, delinquent, neglectful, remiss -- (failing in what duty requires; "derelict (or delinquent) in his duty"; "neglectful of his duties"; "remiss of you not to pay your bills")
(Sound)
