neg⋅li⋅gent
   /ˈnɛglɪdʒənt/ Show Spelled Pronunciation [neg-li-juhnt] Show IPA
–adjective
1. guilty of or characterized by neglect, as of duty: negligent officials.
2. lazily careless; offhand: a negligent wave of his manicured hand.

neg⋅li⋅gence
   /ˈnɛglɪdʒəns/ Show Spelled Pronunciation [neg-li-juhns] Show IPA
–noun
1. the quality, fact, or result of being negligent; neglect: negligence in discharging one's responsibilities.
2. an instance of being negligent: a downfall brought about by many negligences.
3. Law. the failure to exercise that degree of care that, in the circumstances, the law requires for the protection of other persons or those interests of other persons that may be injuriously affected by the want of such care.
–adjective
4. Law. pertaining to or involving a civil action for compensation for damages filed by a person who claims to have suffered an injury or loss in an accident caused by another's negligence: a negligence suit; a large negligence award.

http://dictionary.reference.com/browse/negligence