nonchalant

/ˌnän-shə-ˈlänt/

French, from Old French, from present participle of nonchaloir to disregard, from non- + chaloir to concern, from Latin calēre to be warm

adjective

  1. having an air of easy unconcern or indifference

cool composed collected unruffled imperturbable nonchalant mean free from agitation or excitement. cool may imply calmness, deliberateness, or dispassionateness. composed implies freedom from agitation as a result of self-discipline or a sedate disposition.