INEXPLORABLE

\ˌɪnɛksplˈɔːɹəbə͡l], \ˌɪnɛksplˈɔːɹəbə‍l], \ˌɪ_n_ɛ_k_s_p_l_ˈɔː_ɹ_ə_b_əl]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.