negligence Definition

1. Being negligent.
2. Lack of proper attention or care; carelessness; neglect.

Thesaurus: carelessness, oversight, neglect, indifference, inadvertence, laxness, omission, inattention, forgetfulness, disregard, slackness, stupidity; Antonym: attentiveness, care, regard.
3. law.
A breach of a legal duty of care for others.