知之甚微

to know very little about

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

to know / to be aware

surname Wei / ancient Chinese state near present day Chongqing / Taiwan pr. [Wei2]

tiny / miniature / slightly / profound / abtruse / to decline / one millionth part of / micro- / Taiwan pr. [wei2]

variant of 什[shen2]

what / very / extremely / any

very small / very little / scant / minimal