不知所之

whereabouts unknown

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

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

(possessive particle, literary equivalent of 的[de5]) / him / her / it

to know / to be aware

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