nonchalant

Meanings

1. 1
   adj

   Casually calm and relaxed.

   We handled the whole frenetic situation with a nonchalant attitude.

2. 2
   adj

   Indifferent; unconcerned; behaving as if detached.

   He is far too nonchalant about such a serious matter.

3. 3
   adj

   marked by blithe unconcern

Etymology

Borrowed from French nonchalant, from Old French nonchaloir (“to be unconcerned”), from non- (“not”) + chaloir (“to have concern for”), from Latin non (“not”) + calēre (“to be warm”).