American Heritage® Dictionary of the English Language, Fourth 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.
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.
- adj. Marked by or showing lack of due thought or care; careless.
- adj. Inconsiderate, inattentive.
- adj. Lacking thought or consideration.
GNU Webster's 1913
- adv. Lacking thought; careless; inconsiderate; rash.
- adv. rare Giddy; gay; dissipated.
- adv. Deficient in reasoning power; stupid; dull.
- adj. without care or thought for others
- adj. showing lack of careful thought
- thought + -less (Wiktionary)
“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,”
“Thoughtlessness is an attribute, grounded on the facts which we call thoughtless actions; and the proposition is equivalent to this,”
“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.”
“I had never thought about it that way before: will she find the descriptive term thoughtless, or thoughtful?”
“Zywicki is calling her thoughtless and unreflective in this matter.”
“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.”
“Which surely is a better fate than to be called a thoughtless person?”
“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”
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