Negligent (adjective)

1. Failing to take proper care in doing something.
2. Failing to take action that is required by law or duty.

Origin:

From latin negligens, present participle of negligere ("to be neglectful"), from neglegere, from neg- ("not") + legere ("to gather, to choose").

Examples:

1. The company was found to be negligent in maintaining its equipment, resulting in the accident.
2. The nurse was negligent in her duties and failed to properly monitor the patient.
3. The court found the driver to be negligent due to his excessive speed and disregard for traffic signals.
4. The landlord was negligent in addressing the mold problem in the apartment.
5. The parents were deemed negligent for not supervising their child properly.