IMPREGNABL

\ɪmpɹˈɛɡnabə͡l], \ɪmpɹˈɛɡnabə‍l], \ɪ_m_p_ɹ_ˈɛ_ɡ_n_a_b_əl]\
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1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald