YOU SAID:

i did this because i was quite bored

INTO JAPANESE

かなり退屈だったからやった

BACK INTO ENGLISH

I did it because I was pretty bored.

INTO JAPANESE

つまらなかったからやったんだ

BACK INTO ENGLISH

I did it because it was boring.

INTO JAPANESE

つまらないからやった。

BACK INTO ENGLISH

I did it because it was boring.