INEXPLAINABLE

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