INDUBITABLY

\ɪndjˈuːbɪtəblɪ], \ɪndjˈuːbɪtəblɪ], \ɪ_n_d_j_ˈuː_b_ɪ_t_ə_b_l_ɪ]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1871 - The Cabinet Dictionary of the English Language