Webster's English Dictionary

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inexplicable

in.ex.pli.ca.ble \.in-ik-'splik-*-b*l, (')in-'ek-(.)splik-\ \-ble-\ aj [MF, 
   fr. L inexplicabilis, fr. in- + explicabilis explicable] : incapable of 
   being explained, interpreted, or accounted for  - in.ex.pli.ca.ble.ness n