三不知

to know nothing about the beginning, the middle or the end / to know nothing at all

three / 3

the three no's (abbreviated catchphrase)

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

lit. to reply "don't know" whatever the question (idiom) / fig. absolutely no idea of what's going on / complete ignorance