行若无事

词典解释

[behave as if nothing had happened] 行:行动、举止。指在紧急关头上能够举止镇静,毫不慌乱。也形容对事情听之任之,无动于衷

成语解释

指人在紧急关头；态度镇静；毫不慌乱。有时也指对坏人坏事听之任之；满不在乎。若：好像。