Etymology
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negligent (adj.)

late 14c., necligent, of persons, "remiss, indifferent to duty," from Old French negligent "careless, negligent" (13c.) and directly from Latin negligentem (nominative neglegens) "heedless, careless, unconcerned," present participle of neglegere "to neglect" (see neglect (v.)). Of action, conduct, etc., c. 1500. Related: Negligently.

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Definitions of negligent

negligent (adj.)
characterized by neglect and undue lack of concern;
negligent in his correspondence
negligent of detail
negligent parents
From wordnet.princeton.edu