YOU SAID:

She's a tough nut to crack

INTO JAPANESE

彼女はなかなか手ごわい相手だ

BACK INTO ENGLISH

She is quite a formidable opponent

INTO JAPANESE

彼女はかなり手強い相手だ

BACK INTO ENGLISH

She's a pretty tough opponent

INTO JAPANESE

彼女はかなり手強い相手だ

BACK INTO ENGLISH

She's a pretty tough opponent