nonchalant Meaning, Definition & Usage

  1. adjective satellite marked by blithe unconcern
    casual; insouciant.
    • an ability to interest casual students
    • showed a casual disregard for cold weather
    • an utterly insouciant financial policy
    • an elegantly insouciant manner
    • drove his car with nonchalant abandon
    • was polite in a teasing nonchalant manner

WordNet

Non`cha`lant" adjective
Etymology
F., fr. non not (L. non) + chaloir to concern one's self for, fr. L. calere to be warm, to be inflamed with desire, to be troubled. See Non-, and Caldron.
Definitions
  1. Indifferent; careless; cool.

Webster 1913