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Adjective: negligent  ne-gli-junt
  1. Characterized by neglect and undue lack of concern
    "negligent parents"; "negligent of detail"; "negligent in his correspondence"

See also: careless, cavalier, delinquent, derelict, hit-and-run, inattentive, lax, neglectful, remiss, slack, unattentive [rare]

Antonym: diligent

Encyclopedia: Negligent