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thoughtlessness

 [thawt-lis]   Origin

thought·less

   [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

Related forms
thought·less·ly, adverb
thought·less·ness, noun

Synonyms
1. negligent, neglectful. 3. inattentive, remiss.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Thoughtlessness is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a scrap or morsel of food left at a meal.
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Collins
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

thoughtless
"inconsiderate," 1794, from thought + -less.
Online Etymology Dictionary, © 2010 Douglas Harper
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