INCONVERTIBLY

\ɪnkənvˈɜːtəblɪ], \ɪnkənvˈɜːtəblɪ], \ɪ_n_k_ə_n_v_ˈɜː_t_ə_b_l_ɪ]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.