UNEXCOGITABLE

\ˌʌnɛkskˈɒd͡ʒɪtəbə͡l], \ˌʌnɛkskˈɒd‍ʒɪtəbə‍l], \ˌʌ_n_ɛ_k_s_k_ˈɒ_dʒ_ɪ_t_ə_b_əl]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson