只可意会，不可言传

zhǐ kě yì huì , bù kě yán chuán

can be understood, but not described (idiom, from Zhuangzi 莊子|庄子[Zhuang1 zi3]); mysterious and subtle

只

zhǐ

variant of 只[zhi3]

可

kě

(prefix) can; may; able to; -able

意

yì

idea

会

huì

can; to have the skill; to know how to

，

不

bù

no; not so

可

kě

(prefix) can; may; able to; -able

言

yán

words

传

chuán

to pass on