neglectful

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

inattentive remiss delinquent derelict

neglectfully neglectfulness