nonchalance 英音：['nɔnʃələns]美音：['nɑnʃələns]
n. 漠不关心,无动于衷,若无其事
同义词：[n.] indifference, unconcern
例句参考：
His nonchalant attitude [nonchalance] irritated me.
他那漠不关心的态度使我恼火。
名词解释：
the trait of remaining calm and seeming not to care; a casual lack of concern [同] indifference, nonchalance, unconcern