non·cha·lant 
/ˌnɑ:nʃəˈlɑ:nt/ adjective
/ˌnɑ:nʃəˈlɑ:nt/ adjective [more nonchalant; most nonchalant] : relaxed and calm in a way that shows that you do not care or are not worried about anything
▪ He was surprisingly nonchalant about winning the award. ▪ She faced the crowd with the nonchalant ease of an experienced speaker. ▪ The team may have been somewhat nonchalant at the beginning of the season, but they now know that they need to work hard.
▪ He was surprisingly nonchalant about winning the award. ▪ She faced the crowd with the nonchalant ease of an experienced speaker. ▪ The team may have been somewhat nonchalant at the beginning of the season, but they now know that they need to work hard.
— non·cha·lance /ˌnɑ:nʃəˈlɑ:ns/ noun [noncount]
▪ She faced the crowd with the nonchalance of an experienced speaker. ▪ His nonchalance about winning the award is a little surprising.
/ˌnɑ:nʃəˈlɑ:ns/ noun [noncount] ▪ She faced the crowd with the nonchalance of an experienced speaker. ▪ His nonchalance about winning the award is a little surprising.
— non·cha·lant·ly adverb
