INCONVERSABLE

\ɪnkənvˈɜːsəbə͡l], \ɪnkənvˈɜːsəbə‍l], \ɪ_n_k_ə_n_v_ˈɜː_s_ə_b_əl]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan