UNEXPECTEDLY

\ˌʌnɛkspˈɛktɪdlɪ], \ˌʌnɛkspˈɛktɪdlɪ], \ˌʌ_n_ɛ_k_s_p_ˈɛ_k_t_ɪ_d_l_ɪ]\
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1871 - The Cabinet Dictionary of the English Language