风马牛不相及 fēng mǎ niú bù xiāng jí

DEFINITIONS

  1. to be completely unrelated to one another (idiom)
  2. irrelevant

CHARACTERS

风 fēng wind; air; manners, atmosphere
马 mǎ horse; surname; KangXi radical 187
牛 niú cow, ox, bull; KangXi radical93
不 bù no, not; un-; negative prefix
相 xiāng mutual, reciprocal, each other
及 jí extend; reach; come up to; and