INDUBIOUS

\ɪndjˈuːbɪəs], \ɪndjˈuːbɪəs], \ɪ_n_d_j_ˈuː_b_ɪ__ə_s]\
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1899 - The american dictionary of the english language.
By Daniel Lyons
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan