INCONSIDERABLY

\ɪnkənsˈɪdəɹəblɪ], \ɪnkənsˈɪdəɹəblɪ], \ɪ_n_k_ə_n_s_ˈɪ_d_ə_ɹ_ə_b_l_ɪ]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.
 
1871 - The Cabinet Dictionary of the English Language