nonchalantly

Từ điển Oxford Advanced Learner 8th

non·cha·lant·ly BrE [ˈnɒnʃələntli] ; NAmE [ˌnɑːnʃəˈlɑːntli] adverb
•He was leaning nonchalantly against the wall.
•‘I already know,’ she replied nonchalantly.
Main entry: ↑nonchalant_derived