INDEPREHENSIBLE

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