not have the first idea
know beans about
unknown
nothing
noninformative
newsless
have no idea
hill of beans
in the dark
ignorant
shit all
noninformational
be not to know
untouched
noninformation
diddly-squat
nonmention
cake crumbs
whistle in the dark
telltale
air
dog shit
silent as the grave
not a sausage
not a one
thingless
unfamiliar with
dick all
tell all
unacquainted with
take a shot in the dark
unacquainted
damn all
flea
doobry
uninvolving
apropos of nothing
unconfidential
unbeknown
fuck all
n-word
simi
uncoupler
unasked
unmystery
well-kept
not have the faintest
short
not have the faintest idea
cloud