1. failing in what duty requires - derelict (or delinquent) in his duty - neglectful of his duties - remiss of you not to pay your bills • Syn: derelict, delinquent, remiss • Similar to: negligent • Derivationally related forms: remissness (for: remiss), neglectfulness 2. not showing due care or attention - inattentive students - an inattentive babysitter - neglectful parents • Syn: inattentive • Similar to: negligent • Derivationally related forms: neglectfulness, inattentiveness (for: inattentive)