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Definition of "thoughtless" []

  • Marked by or showing lack of due thought or care; careless. See Synonyms at careless. (adjective)
  • Inconsiderate; inattentive: a thoughtless remark. (adjective)
  • Lacking thought: The debate turned into thoughtless bickering. (adjective)
  • Inconsiderate (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • Having or showing lack of thought (adjective)
  • Unable to think; not having the power of thought (adjective)

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Use "thoughtless" in a sentence
  • "There is never a need to deny the harm that ignorance can cause, and use of the term thoughtless usually refers to some action taken without thoughtful consideration."
  • "It's what I call thoughtless safety, and it brings you about 3 1-2 per cent, as I have already shown you."
  • "Thoughtlessness is an attribute grounded on the facts which we call thoughtless actions; and the proposition is equivalent to this,"