indemonstrable

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in·de·mon·stra·ble

 (ĭn′dĭ-mŏn′strə-bəl)
adj.
Impossible to prove or demonstrate: a seemingly valid but indemonstrable hypothesis.

in′de·mon′stra·bil′i·ty n.
in′de·mon′stra·bly adv.

indemonstrable

(ˌɪndɪˈmɒnstrəbəl)
adj
incapable of being demonstrated or proved
ˌindeˌmonstraˈbility n
ˌindeˈmonstrably adv

in•de•mon•stra•ble

(ˌɪn dɪˈmɒn strə bəl, ɪnˈdɛm ən-)

adj.
incapable of being demonstrated.
[1560–70]
in`de•mon′stra•bly, adv.