不可同日而語
Can't be mentioned on the same day.
Not to be mentioned in the same breath. Not to be lumped together.
eg:John's idea is different from Jean's, they can't be mentioned on the same day.
中英俚語俗語來源:漢書·息夫躬傳:“臣與祿(公孫祿)異議,未可同日語也。”
反義詞:相提并論 Place on par.