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Characterized by neglect; heedless: neglectful of their responsibilities. See Synonyms at negligent.
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|Noun||1.||neglectfulness - the trait of neglecting responsibilities and lacking concern|
dereliction, willful neglect, delinquency - a tendency to be negligent and uncaring; "he inherited his delinquency from his father"; "his derelictions were not really intended as crimes"; "his adolescent protest consisted of willful neglect of all his responsibilities"