UNRESERVEDLY

\ˌʌnɹɪsˈɜːvɪdlɪ], \ˌʌnɹɪsˈɜːvɪdlɪ], \ˌʌ_n_ɹ_ɪ_s_ˈɜː_v_ɪ_d_l_ɪ]\
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1871 - The Cabinet Dictionary of the English Language