Open English Wordnet
Adjectives
(s)inattentive, neglectfulnot showing due care or attention“inattentive students”, “an inattentive babysitter”, “neglectful parents”
(s)derelict, delinquent, neglectful, remissfailing in what duty requires“derelict (or delinquent) in his duty”, “neglectful of his duties”, “remiss of you not to pay your bills”