"neglectful" in the adjective sense
1. inattentive, neglectful
not showing due care or attention
"inattentive students"
"an inattentive babysitter"
"neglectful parents"
2. 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"
Source: WordNet® (An amazing lexical database of English)
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