un·con·cern

[uhn-kuhn-surn]
noun
1.
absence of feeling or concern; indifference.
2.
freedom from anxiety.

Origin:
1660–70; un-1 + concern


1. nonchalance, insouciance. See indifference.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
unconcern (ˌʌnkənˈsɜːn) [Click for IPA pronunciation guide]
 
n
apathy or indifference

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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00:10
Unconcern is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a gadget; dingus; thingumbob.
Example sentences
The record is convincing that the violations were not the result of intentional
  actions or unconcern.
The friend changes his expression of alarm for one of utter unconcern.
He was walking slowly and with apparent unconcern, though the iron hailed
  around him.
It was done in tranquil, matter-of-fact fashion, and the snakes behaved with
  equally tranquil unconcern.
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