IRREVEALABLE

\ɪɹɪvˈiːləbə͡l], \ɪɹɪvˈiːləbə‍l], \ɪ_ɹ_ɪ_v_ˈiː_l_ə_b_əl]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.