TRANQUILLIZINGLY

\tɹˈankwɪlˌa͡ɪzɪŋlɪ], \tɹˈankwɪlˌa‍ɪzɪŋlɪ], \t_ɹ_ˈa_n_k_w_ɪ_l_ˌaɪ_z_ɪ_ŋ_l_ɪ]\
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1871 - The Cabinet Dictionary of the English Language