unknowable
nonknowable
unknown
unrevealable
indiscoverable
answerless
irrevealable
private
unascertainable
unascertained
unanswerable
unfamiliar
unfamiliarized
ungleaned
unbeknown
nondescribable
unlearnable
unclarifiable
insensible
unindividuable
indeterminable
nonanswerable
secret
unacquaintable
unrealizable
nonobservable
nonrecognized
nonfamiliar
undeterminable
nonidentifiable
inaccessible
unconcretizable
not have the faintest idea
undemonstrable
undisclosed
nonsolvable
unrevealed
unspeakable
unestablished
nonestablished
unindividuatable
unexperienced
unsolvable
not have the faintest
nonperceptible
unlocatable
knowledgelessness
nonapparent
unintelligible
indistinguishable