无关

wú guān jǐn yào

无关紧要

of no consequence

xiāng hù wú guān

相互无关

be independent of each other

zhè yǔ tā rén wú guān

这与他人无关。

This is of no concern to others.

bǎ nà fēng xìn huán gěi wǒ zhè gēn nǐ wú guān

把那封信还给我！这跟你无关！

Give me back that letter! It's none of your business!