[不可同日而语 / 不可同日而語, bù kě tóng rì ér yǔㄅㄨˋ ㄎㄜˇ ㄊㄨㄥˊ ㄖˋ ㄦˊ ㄩˇ] lit. mustn't speak of two things on the same day (成语 saw); not to be mentioned in the same breath; incomparable#38058
[不可知论 / 不可知論, bù kě zhī lùnㄅㄨˋ ㄎㄜˇ ㄓ ㄌㄨㄣˋ] agnosticism, the philosophical doctrine that some questions about the universe are in principle unanswerable#377320
[只可意会,不可言传 / 只可意會,不可言傳, zhǐ kě yì huì, bù kě yán chuánㄓˇ ㄎㄜˇ ㄧˋ ㄏㄨㄟˋ, ㄅㄨˋ ㄎㄜˇ ㄧㄢˊ ㄔㄨㄢˊ] can be understood, but not described (成语 saw, from Zhuangzi 莊子|庄子); mysterious and subtle, See Also: 成语, 莊子, 庄子
[可以意会,不可言传 / 可以意會,不可言傳, kě yǐ yì huì, bù kě yán chuánㄎㄜˇ ㄧˇ ㄧˋ ㄏㄨㄟˋ, ㄅㄨˋ ㄎㄜˇ ㄧㄢˊ ㄔㄨㄢˊ] can be understood, but not described (成语 saw, from Zhuangzi 莊子|庄子); mysterious and subtle, See Also: 成语, 莊子, 庄子
[家丑不可外传 / 家醜不可外傳, jiā chǒu bù kě wài chuánㄐㄧㄚ ㄔㄡˇ ㄅㄨˋ ㄎㄜˇ ㄨㄞˋ ㄔㄨㄢˊ] The shame of the family must not be spread abroad (俗语 common expression); Don't wash your dirty linen in public., See Also: 俗语
[机不可失,时不再来 / 機不可失,時不再來, jī bù kě shī, shí bù zài láiㄐㄧ ㄅㄨˋ ㄎㄜˇ ㄕ, ㄕˊ ㄅㄨˋ ㄗㄞˋ ㄌㄞˊ] opportunity knocks but once (谚语 proverb); a chance not to miss; Seize the occasion, it will not return., See Also: 谚语