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  1. lacking in consideration for others; inconsiderate; tactless: a thoughtless remark.
  2. characterized by or showing lack of thought: a shallow, thoughtless book.
  3. not thinking enough; careless or heedless: thoughtless of his health.
  4. devoid of or lacking capacity for thought.
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Origin of thoughtless

First recorded in 1585–95; thought1 + -less
Related formsthought·less·ly, adverbthought·less·ness, noun

Synonyms for thoughtless

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for thoughtless


  1. inconsideratea thoughtless remark
  2. having or showing lack of thoughta thoughtless essay
  3. unable to think; not having the power of thought
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Derived Formsthoughtlessly, adverbthoughtlessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for thoughtless


"inconsiderate," 1794, from thought + -less. Related: Thoughtlessly; thoughtlessness.

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Online Etymology Dictionary, © 2010 Douglas Harper