unconcerned

[uhn-kuhn-surnd]
adjective
1.
not involved or interested; disinterested.
2.
not caring; unworried; free from solicitude or anxiety.

Origin:
1625–35; un-1 + concerned

unconcernedly [uhn-kuhn-sur-nid-lee] , adverb
unconcernedness, noun


2. untroubled, unperturbed, composed, carefree.
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World English Dictionary
unconcerned (ˌʌnkənˈsɜːnd)
 
adj
1.  lacking in concern or involvement
2.  not worried; untroubled
 
unconcernedly
 
adv
 
uncon'cernedness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

unconcerned
c.1635, from un- (1) "not" + pp. of concern.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Only fifty yards away from the carnage the springbok graze unconcerned.
Some critics, though, are unconcerned with philosophical debates about what
  scientists should or shouldn't do.
My professor seemed unconcerned about the humiliation he caused them.
He, however, seems unconcerned with this or the fate of these many students.
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