be nonchalant
It's a Chinese idiom, Ti á Nb ù w é iy ì in pinyin, which means to be calm and indifferent. It comes from the book of begging for almsgiving and repairing the house.
source
Su Shi of the Song Dynasty wrote in the book of begging for almsgiving and mending the house for the sake of being in power: "there is no benevolence and saints in the world, and all the sages are willing to use it together, but they are willing to be indifferent."
Examples
Only Meng Ming is brave and thinks that success is inevitable. Yu Shaoyu's Chronicles of the Eastern Zhou Dynasty Chapter 44
be nonchalant
The mouth is full of the constitution - kǒu hán tiān xiàn
discard the classics and rebel against orthodoxy - lí jīng pàn dào
The party and the party work together - ē dǎng xiāng wéi