thoughtless

[thawt-lis]
adjective
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.

Origin:
1585–95; thought1 + -less

thoughtlessly, adverb
thoughtlessness, noun


1. negligent, neglectful. 3. inattentive, remiss.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thoughtless (ˈθɔːtlɪs)
 
adj
1.  inconsiderate: a thoughtless remark
2.  having or showing lack of thought: a thoughtless essay
3.  unable to think; not having the power of thought
 
'thoughtlessly
 
adv
 
'thoughtlessness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

thoughtless
"inconsiderate," 1794, from thought + -less.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Most home fi res are due to careless or thoughtless behavior, and are easily preventable.
The act or behavior may be thoughtless or something you did not mean to do.
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