INDECLINABLE

\ˌɪndɪklˈa͡ɪnəbə͡l], \ˌɪndɪklˈa‍ɪnəbə‍l], \ˌɪ_n_d_ɪ_k_l_ˈaɪ_n_ə_b_əl]\
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1899 - The american dictionary of the english language.
By Daniel Lyons
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan