guilty of or characterized by neglect, as of duty: negligent officials.
lazily careless; offhand: a negligent wave of his manicured hand.

1350–1400; Middle English, variant of necligent < Latin negligent-, necligent-, stem of negligēns, present participle of negligere, variant of neglegere to neglect; see -ent

negligently, adverb
nonnegligent, adjective
nonnegligently, adverb
overnegligent, adjective
overnegligently, adverb
prenegligent, adjective
quasi-negligent, adjective
supernegligent, adjective
supernegligently, adverb
unnegligent, adjective

1. neglectful. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
negligent (ˈnɛɡlɪdʒənt)
1.  habitually neglecting duties, responsibilities, etc; lacking attention, care, or concern; neglectful
2.  careless or nonchalant

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c.; see negligence. Related: Negligently.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Anyone who stated that stuff couldn't happen here would be considered negligent
  and out the door in a nano second.
The environmental effects, good or bad, are side effects resulting from a
  negligent decision with the intention of personal gain.
To vary from what is acceptable practice can be an irresponsible and negligent
  act for a university officer.
To do less is professionally irresponsible and would appear to be negligent.
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