IRREFORMABLE

\ɪɹɪfˈɔːməbə͡l], \ɪɹɪfˈɔːməbə‍l], \ɪ_ɹ_ɪ_f_ˈɔː_m_ə_b_əl]\
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1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson