INDISSOCIABLE

\ˌɪndɪsˈə͡ʊʃi͡əbə͡l], \ˌɪndɪsˈə‍ʊʃi‍əbə‍l], \ˌɪ_n_d_ɪ_s_ˈəʊ_ʃ_iə_b_əl]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson