thoughtless

[thawt-lis]

adjective

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

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

Synonyms for thoughtless

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


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British Dictionary definitions for thoughtless

thoughtless

adjective

inconsideratea thoughtless remark
having or showing lack of thoughta thoughtless essay
unable to think; not having the power of thought
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
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper