INDISCOVERABLE

\ˌɪndɪskˈʌvəɹəbə͡l], \ˌɪndɪskˈʌvəɹəbə‍l], \ˌɪ_n_d_ɪ_s_k_ˈʌ_v_ə_ɹ_ə_b_əl]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.