Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Lack of care.

from the GNU version of the Collaborative International Dictionary of English

  • n. The quality or state of being careless; heedlessness; negligence; inattention.

from The Century Dictionary and Cyclopedia

  • n. The state or quality of being careless; heedlessness; inattention; negligence.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. failure to act with the prudence that a reasonable person would exercise under the same circumstances
  • n. the quality of not being careful or taking pains

Etymologies

From Middle English *carelesnes, *carlesnesse, from Old English carlēasnes ("freedom from care, security, carelessness"), equivalent to careless +‎ -ness. (Wiktionary)

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