GUILELESSLY

\ɡˈa͡ɪlləslɪ], \ɡˈa‍ɪlləslɪ], \ɡ_ˈaɪ_l_l_ə_s_l_ɪ]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.