UNEXCOGITABLE
\ˌʌnɛkskˈɒd͡ʒɪtəbə͡l], \ˌʌnɛkskˈɒdʒɪtəbəl], \ˌʌ_n_ɛ_k_s_k_ˈɒ_dʒ_ɪ_t_ə_b_əl]\
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un-eks-koj'i-ta-bl, adj. not conceivable.
By Thomas Davidson