完全不相关英文

They have nothing to do wth each other.

不相关的 [词典] irrelevant; [计] uncorrelated; disrelated; foreign; irrelated; [例句]他吸收利用互不相关的零碎信息的能耐惊人。His ability to absorb bits of disconnected information was astonishing.

there is no relationship between them.

irrelevant