not paying enough attention to what one does: a careless typist.
not exact, accurate, or thorough: careless work.
done or said heedlessly or negligently; unconsidered: a careless remark.
not caring or troubling; having no care or concern; unconcerned (usually followed by of, about, or in ): careless of the rights of others; careless about one's behavior; careless in speech.
possessed or caused without effort or art; unstudied: careless beauty.
Archaic. free from anxiety.

before 1000; Middle English; Old English carlēas. See care, -less

carelessly, adverb
carelessness, noun
overcareless, adjective
overcarelessly, adverb
overcarelessness, noun

1. inattentive, incautious, unwary, indiscreet, reckless. 2. inaccurate, negligent. 3. unthoughtful, unmindful. 4. thoughtless, forgetful; inconsiderate.

1–4. careful. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
careless (ˈkɛəlɪs)
adj (often foll by in, of, or about)
1.  done with or acting with insufficient attention; negligent
2.  unconcerned in attitude or action; heedless; indifferent (to): she's very careless about her clothes
3.  (usually prenominal) carefree
4.  (usually prenominal) unstudied; artless: an impression of careless elegance

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. carleas "free from anxiety, unconcerned," from care + -less. Meaning "inattentive, not taking due care" is first recorded 1561, in carelessly.

O.E. carleasnes (see careless).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Candidates have been eliminated because of such carelessness.
In an age of spell check and grammar check, errors reflect a carelessness that
  could be significant.
So consider the potential carelessness of other people, as well as your own,
  when considering what could go wrong.
It's usually carelessness that leads to all those babies anyway.
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