Not anxious or apprehensive; unworried.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "unconcerned" in a sentence
"... the Establishment Clause permits this disregard of polytheists and believers in unconcerned deities, just as it permits the disregard of devout atheists."
"So unconcerned, that is, that he recently told Rep. Marty Meehan that he did not believe that firing all"
"Expression unconcerned, Richard stood while the head gaoler picked up the empty box, shook it to hear if it rattled, rapped all four sides, top and bottom."