YOU SAID:
He dislikes it for the most part
INTO JAPANESE
彼は大部分それを嫌います
BACK INTO ENGLISH
He mostly dislikes it
INTO JAPANESE
彼は主にそれを嫌い
BACK INTO ENGLISH
He mainly dislikes it
INTO JAPANESE
彼は主にそれを嫌い
BACK INTO ENGLISH
He mainly dislikes it
Well done, yes, well done!