DK
no idea
iunno
nonfamiliar
your guess is as good as mine
don't ask me
beats me
search me
donchaknow
you tell me
fuck knows
unprecise
nonprecise
noncertain
unfamiliarized
uncertain
nubilous
nonclear
muddy
unknown
puzzly
confusement
head-scratching
bollix
dudder
nondetailed
undetailed
mazy
unelaborated
unexact
not have the faintest idea
not have the faintest
imprecise
nonknowable
you ask me, I ask who
adiagnostic
nondefinite
unfamiliar
secret
fugg
fuck if I know
unevident
cloudy
unexperienced
nondefinitive
boggler
confuzzled
confuzzlement
perplexed
wilsome
suspensory
whaddayaknow
knowledgelessness
bifarious
indefinite
perplexing
nonobvious
unobvious
non-obvious
unsurely
nonascertainable
unrevealable
unconfirmable
at sixes and sevens
all sixes and nines
unclear
non constat
unexacted
nonrevealing
don't-know
unknowable
uncertainty
head-scratcher
inexact
puzzlingly
undeterminable
left-handed
unwitting
unclearly
nonknowledge
amphibological
unacquaintable
mystified
turbid
confuzzling
problem
who's to say?
elusive
addled
swallow
ununderstood
unapprehended
maffled
I see, said the blind man
nonunderstood
nonfamiliar
unprecise
nonprecise
noncertain
unfamiliarized
uncertain
nubilous
nonclear
muddy
unknown
puzzly
nondetailed
undetailed
mazy
unelaborated
unexact
imprecise
nonknowable
adiagnostic
nondefinite
unfamiliar
unevident
cloudy
unexperienced
nondefinitive
confuzzled
perplexed
wilsome
suspensory
bifarious
indefinite
perplexing
nonobvious
unobvious
non-obvious
nonascertainable
unrevealable
unconfirmable
unclear
unexacted
nonrevealing
inexact
unknowable
undeterminable
left-handed
unwitting
amphibological
unacquaintable
mystified
turbid
confuzzling
elusive
addled
ununderstood
unapprehended
maffled
nonunderstood
unsurely
puzzlingly
unclearly
confusement
head-scratching
bollix
dudder
secret
fugg
boggler
confuzzlement
knowledgelessness
uncertain
don't-know
unknowable
uncertainty
head-scratcher
nonknowledge
problem
not have the faintest idea
not have the faintest
swallow
bollix
English words for 'don't know'
As you may have noticed, above you will find words for "don't know". Hover the mouse over the word you'd like to know more about to view its definition. Click 
to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.
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