Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Marked by or showing lack of due thought or care; careless.
  • adj. Inconsiderate, inattentive.
  • adj. Lacking thought or consideration.

from the GNU version of the Collaborative International Dictionary of English

  • adv. Lacking thought; careless; inconsiderate; rash.
  • adv. Giddy; gay; dissipated.
  • adv. Deficient in reasoning power; stupid; dull.

from The Century Dictionary and Cyclopedia

  • Devoid of or lacking capacity for thought.
  • Unthinking; heedless; careless; giddy.
  • Synonyms Heedless, Remiss, etc. (see negligent), regardless, inattentive, inconsiderate, unmindful, flighty, harebrained.

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

  • adj. without care or thought for others
  • adj. showing lack of careful thought

Etymologies

thought +‎ -less (Wiktionary)

Examples

  • 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.

    Gangaji: Going Inside: Direct Experience Is Like a True Kiss

  • It's what I call thoughtless safety, and it brings you about 3 1-2 per cent, as I have already shown you.

    Mother

  • Thoughtlessness is an attribute grounded on the facts which we call thoughtless actions; and the proposition is equivalent to this,

    A System Of Logic, Ratiocinative And Inductive (Vol. 1 of 2)

  • Thoughtlessness is an attribute, grounded on the facts which we call thoughtless actions; and the proposition is equivalent to this,

    A System Of Logic, Ratiocinative And Inductive

  • You, whom she had known from an infant, whom she had seen grow up from a period when her notice was an honour, to have you now, in thoughtless spirits, and the pride of the moment, laugh at her, humble her [...] and before others, many of whom (certainly some,) would be entirely guided by your treatment of her.

    Boxing Emma; or the Reader’s Dilemma at the Box Hill Games

  • I had never thought about it that way before: will she find the descriptive term thoughtless, or thoughtful?

    Advertising Age - Homepage

  • Zywicki is calling her thoughtless and unreflective in this matter.

    The Volokh Conspiracy » The “Wise Latina”:

  • What used to be described as a thoughtless act of aggression was now regarded as the courage one would expect to find in a party member; to think of the future and wait was merely another way of saying one was a coward; any idea of moderation was just an attempt to disguise one's unmanly character; ability to understand a question from all sides meant that one was totally unfitted for action.

    Balkinization

  • Which surely is a better fate than to be called a thoughtless person?

    Symposium

  • Sophocles himself has given utterance to two diametrically opposite opinions: — [Greek: Pollo to phronein eudaimonias proton uparchei.] 25 he says in one place — wisdom is the greatest part of happiness; and again, in another passage, he declares that the life of the thoughtless is the most pleasant of all — [Greek: En ta phronein gar maeden aedistos bios.] 26

    The Wisdom of Life

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