不知所云

to not know what sb is driving at / to be unintelligible

no; not so / (bound form) not; un-

not to know / unaware / unknowingly / fig. not to admit (defeat, hardships, tiredness etc)

to know / to be aware

actually / place / classifier for houses, small buildings, institutions etc / that which / particle introducing a relative clause or passive / CL:個|个[ge4]

(classical) to say

surname Yun / abbr. for Yunnan Province 雲南省|云南省[Yun2 nan2 Sheng3]

cloud / CL:朵[duo3]