YOU SAID:

my sister is an absolute freak

INTO JAPANESE

私の妹は絶対フリークです。

BACK INTO ENGLISH

My sister is an absolute freak.

INTO JAPANESE

私の妹は絶対マニアです。

BACK INTO ENGLISH

My sister is absolute mania.

INTO JAPANESE

私の妹は、絶対マニアです。

BACK INTO ENGLISH

My sister is an absolute maniac.

INTO JAPANESE

私の妹は絶対マニアックです。

BACK INTO ENGLISH

My sister is an absolute maniac.