14
have no idea(expression, idiom, formal, negation, nescience)
9
have no clue(informal, expression, idiom, negation, nescience)
9
can't tell(formal, verb, negation, nescience)
9
donno(informal, verb, negation, nescience)
8
dunno(informal, verb, negation, nescience)
7
do not know(formal, verb, negation, nescience)
7
search me(slang, expression, idiom, nescience)
6
can't say(formal, verb, negation, nescience)
6
no way to tell(informal, expression, negation, american, nescience)
6
there is no way to tell(informal, expression, negation, american, nescience)
5
not really up on this issue(informal, expression, negation, nescience)
5
can not tell(formal, verb, negation, nescience)
5
cannot say(formal, verb, negation, nescience)
5
could not say(formal, verb, negation, nescience)
5
could not tell(formal, verb, negation, nescience)
5
couldn't say(formal, verb, negation, nescience)
5
couldn't tell(formal, verb, negation, nescience)
5
do not kno(informal, verb, negation, nescience)
5
do not kno'(informal, verb, negation, nescience)
5
do not realize(verb, negation, nescience)
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APASmart Define. (-0001). don't know thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/don%27t_know/thesaurus/synonyms
ChicagoSmart Define. -0001. "don't know thesaurus" https://smartdefine.org/don%27t_know/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define -0001, don't know thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/don%27t_know/thesaurus/synonyms>.
MLASmart Define. "don't know thesaurus" 30 November -0001. Web. 21 September 2026. <https://smartdefine.org/don%27t_know/thesaurus/synonyms>