carelessness, a failure to show good judgement and proper care when doing something, the quality of showing neglect in some way, or an instance of such conduct;
e.g. The foreman's negligence resulted in unsafe working conditions.
(noun)
in legal usage, a failure to show reasonable judgement and good care, which results in injury or damage to someone or their property;
e.g. She was charged with negligence due to her dangerous driving.