IMPROSPEROUSLY

\ɪmpɹˈɒspəɹəsli], \ɪmpɹˈɒspəɹəsli], \ɪ_m_p_ɹ_ˈɒ_s_p_ə_ɹ_ə_s_l_i]\
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1790 - A Complete Dictionary of the English Language
By Thomas Sheridan