Definition of "nonchalant" []

• Seeming to be coolly unconcerned or indifferent. See Synonyms at cool. (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.

• "At that moment, she gave a new meaning to the word nonchalant when she casually adjusted her right foot to let her arm rest on her knee and placed the other foot on the floor."
• "That's what I call a nonchalant dismissive attitude that we can all aspire to."
• "“Yes,” I said, trying to keep my expression nonchalant, “but at least you’ll have a reputation.”"