UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌʌnkənˈsɜːrnd/US:USA pronunciation: respellingUSA pronunciation: respelling(un′kən sûrnd)

WordReference Random House Unabridged Dictionary of American English © 2020
un•con•cerned  (un′kən sûrnd),USA pronunciation adj. 
  1. not involved or interested; disinterested.
  2. not caring;
    free from solicitude or anxiety.
un•con•cern•ed•ly  (un′kən sûrnd),USA pronunciation adv.  un′con•cerned•ness, n. 
  • un-1 + concerned 1625–35
    • 2.See corresponding entry in Unabridged . untroubled, unperturbed, composed, carefree.

Collins Concise English Dictionary © HarperCollins Publishers::
unconcerned /ˌʌnkənˈsɜːnd/ adj
  1. lacking in concern or involvement
  2. not worried; untroubled

unconcernedly /ˌʌnkənˈsɜːnɪdlɪ/ adv
WordReference Random House Learner's Dictionary of American English © 2020
un•con•cern /ˌʌnkənˈsɜrn/USA pronunciation   n. [uncountable]
  1. absence of concern;
un•con•cerned, adj. 

WordReference Random House Unabridged Dictionary of American English © 2020
un•con•cern  (un′kən sûrn),USA pronunciation n. 
  1. absence of feeling or concern;
  2. freedom from anxiety.
  • un-1 + concern 1660–70
    • 1.See corresponding entry in Unabridged nonchalance, insouciance. See  indifference. 

'unconcerned' also found in these entries (note: many are not synonyms or translations):

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