分わかりきる

godan verb (-ru), intransitive verb

be obvious; be clear; be completely understood

Expresses that something is so evident it needs no explanation, or that one understands something fully. Often used in the form わかりきっている or わかりきったこと.

• そんなことはわかりきっている。

  That's obvious.

• 彼かれが嘘うそをついているのはわかりきったことだ。

  It was clear that he was lying.