Casually calm and relaxed.
We handled the whole frenetic situation with a nonchalant attitude.
Indifferent; unconcerned; behaving as if detached.
He is far too nonchalant about such a serious matter.
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”).
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Lekhori