INEXPRESSIBLY

\ˌɪnɛkspɹˈɛsəbli], \ˌɪnɛkspɹˈɛsəbli], \ˌɪ_n_ɛ_k_s_p_ɹ_ˈɛ_s_ə_b_l_i]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan