YOU SAID:

This is very boring to do.

INTO JAPANESE

これは行うために非常に退屈です。

BACK INTO ENGLISH

To do this it is very dull.

INTO JAPANESE

これを行うには、非常に鈍いです。

BACK INTO ENGLISH

To do this, very dull.

INTO JAPANESE

これを行うに非常に鈍い。

BACK INTO ENGLISH

To do this in a very dull.

INTO JAPANESE

非常に鈍いでこれを行う。

BACK INTO ENGLISH

Very slow in doing this.

INTO JAPANESE

非常に遅いでこれを行うこと。

BACK INTO ENGLISH

Very slow in doing this.