常識じょうしき
hijō shiki

Noun
na-Adjective

1. lack of common sense; thoughtlessness; senselessness; irrationality; absurdity

あんなことを彼女かのじょうなんて常識じょうしきはなはだしい。
anna kotō kanojoni iunante hijōshikimo hanahadashii.
It's quite absurd of you to tell her that sort of thing.