vacuity
not have the faintest
nonanswer
noninquisitive
not have the faintest idea
insignificant
nonprepositional
unexpress
unperspicacious
uninquisitive
unpinpointed
nondefined
ungleaned
closed-class word
indeclinable
unpinpointable
undistinguished
unconceptualized
answerlessness
function word
nonimplicational
uninferred
unpredetermined
uninquiring
who knows
nonconceptualized
nonpredetermined
nonanswerable
non-descriptive
unquenchingly
nonsynonymous
nonentailed
dunno
nonlexicalizable
nonperiphrastic
unsemanticized
clewless
unperiphrastic
nondescriptional
crosswordy
unclarifying
nonmystery
nonsyntactical
pseudoprefix
unsynonymous
no
nonsuppositional
ignorant
unhyphenated