unascertainable

Impossible to determine

Unable to be determined or found out with certainty.

Something unascertainable lies beyond investigation or verification: The true number of casualties remains unascertainable.

Legal and technical contexts favor this term when facts cannot be established: damages that are unascertainable at the time of contract.

unknowability

unknowable

Impossible to understand

impenetrable · undiscoverable · unreachable · inaccessible · unverifiable · unconfirmable · unprovable · indeterminable · unmeasurable · unquantifiable

ambiguity

unclear

Not easily understood

imprecise · ambiguous · equivocal · indistinct · obscure · murky · hazy · fuzzy · blurry · clouded

hiddenness

concealed

Made invisible deliberately

unrevealed · undisclosed · covert · shrouded · obscured · buried · masked · cloaked · cryptic · opaque

complexity

intricate

Elaborately detailed, many parts

multilayered · tangled · labyrinthine · knotty · dense · abstruse · impenetrable · interwoven · elaborate · byzantine

Opposites
knowability

unascertainableascertainable

Capable of being discovered

determinable · discoverable · verifiable · provable · knowable

Family

certain, certainly, uncertain, uncertainty, certainty, ascertain, certitude, ascertainable, unascertained

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G