nonchalant
/ˌnɑn.ʃəˈlɑnt/ adjective C2- 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.
From the library
Questions and answers followed in a nonchalant manner that made Dantès indignant, for he felt that all the world should have for the poor abbé a love and respect equal to his own.
He sat opposite to me, and lit a cigarette in his old, nonchalant manner.
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