/ˌnɑːnʃəˈlɑːnt/
non·cha·lant
BrE /ˈnɒnʃələnt/
NAmE /ˌnɑːnʃəˈlɑːnt/
behaving in a calm and relaxed way; giving the impression that you are not feeling any anxiety
SYN casual
to appear/look/sound nonchalant
‘It’ll be fine,’ she replied, with a nonchalant shrug.
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non·cha·lance
BrE /ˈnɒnʃələns/
NAmE /ˌnɑːnʃəˈlɑːns/
[U]
an air of nonchalance
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non·cha·lant·ly
BrE /ˈnɒnʃələntli/
NAmE /ˌnɑːnʃəˈlɑːntli/
He was leaning nonchalantly against the wall.