donchaknow
DK
iunno
no idea
nonfamiliar
you tell me
unfamiliarized
not have the faintest
not have the faintest idea
whaddayaknow
nubilous
gnomesayin
uncertain
noncertain
nonknowledge
beats me
don't ask me
doncha
search me
your guess is as good as mine
puzzly
confusement
bollix
head-scratching
dudder
unken
all sixes and nines
nonclear
muddy
at sixes and sevens
don't-know
unprecise
nonprecise
an't
to my knowledge
divent
fuck knows
daint
bisn't
divint
ain't
unwitting
nonknowable
unsurely
non-con
mazy
confuzzling
equivocally
unapprehended
ain'tcha