【若无其事】〖ruò wú qí shì〗[act as if nothing were on one's mind; as if nothing had happened; as if nothing had occurred; as if nothing were wrong]

若昧平生突恍悟，

无动于衷视无睹。

其实不然沉着稳，

事以密成心有数。

像没有那回事一样。形容遇事沉着镇定或不把事情放在心上。Like no such thing. describe meet matter imperturbable cool-headed or do not take things to heart.同：不动声色、泰然自若。反：六神无主、张惶失措。谜：谣传。