iunno
no idea
don't ask me
search me
beats me
your guess is as good as mine
you tell me
DK
fuck knows
you ask me, I ask who
nonfamiliar
donchaknow
noncertain
uncertain
nonprecise
unprecise
head-scratching
bollix
dudder
confusement
unfamiliarized
puzzly
unknown
don't-know
fuck if I know
muddy
nonclear
nubilous
mazy
undetailed
nondefinite
nondetailed
fugg
not have the faintest
AFAIC
not have the faintest idea
unexact
gnomesayin
confuzzlement
to my knowledge
boggler
perplexing
unelaborated
amphibological
confuzzling
suspensory
ion
nondefinitive
elusive
addled