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[thawt-lis] /ˈθɔt lɪs/
lacking in consideration for others; inconsiderate; tactless:
a thoughtless remark.
characterized by or showing lack of thought:
a shallow, thoughtless book.
not thinking enough; careless or heedless:
thoughtless of his health.
devoid of or lacking capacity for thought.
Origin of thoughtless
1585-95; thought1 + -less
Related forms
thoughtlessly, adverb
thoughtlessness, noun
1. negligent, neglectful. 3. inattentive, remiss. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for thoughtlessness
Contemporary Examples
Historical Examples
  • Nothing seemed to matter except to show my knight that after all my selfishness and thoughtlessness and conceit I had freed him.

    The Heather-Moon C. N. Williamson and A. M. Williamson
  • She blamed herself for her thoughtlessness, and resolved that it should not be so in future.

    Janet's Love and Service Margaret M Robertson
  • For me there was no more freedom, no more of hilarity, of thoughtlessness, or of youth.

    Caleb Williams William Godwin
  • However, he now experienced sudden remorse for his thoughtlessness.

  • With all his thoughtlessness, Tom was quick to see and feel these things, and was not spoilt enough yet to laugh at them.

    An Old-fashioned Girl Louisa May Alcott
  • Earnestness is the path of immortality (Nirvana), thoughtlessness the path of death.

    The Dhammapada Unknown
  • The growth of comfort among the rulers meant the growth of thoughtlessness.

  • What a thoughtlessness to press on Russia the convention of Paris?

  • It was Harriet, after all, upon whom the punishment for her mother's thoughtlessness fell.

    The Jamesons Mary E. Wilkins Freeman
British Dictionary definitions for thoughtlessness


inconsiderate: a thoughtless remark
having or showing lack of thought: a thoughtless essay
unable to think; not having the power of thought
Derived Forms
thoughtlessly, adverb
thoughtlessness, 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
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Word Origin and History for thoughtlessness



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

Online Etymology Dictionary, © 2010 Douglas Harper
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