absence of feeling or concern; indifference.
freedom from anxiety.

1660–70; un-1 + concern

1. nonchalance, insouciance. See indifference.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unconcern (ˌʌnkənˈsɜːn)
apathy or indifference

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
He was walking slowly and with apparent unconcern, though the iron hailed
  around him.
But the thing was not for whom he spoke, but what it was he said, with such
  callous unconcern.
It was done in tranquil, matter-of-fact fashion, and the snakes behaved with
  equally tranquil unconcern.
The friend changes his expression of alarm for one of utter unconcern.
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