不可同日而語

1. • lit. mustn't speak of two things on the same day (idiom) not to be mentioned in the same breath
2. • incomparable

Character by character

• 不(bù)no
• 可(kě)can
• 同(tóng)like
• 日(rì)sun
• 而(ér)and
• 語(yǔ)speech