inexplicable

英[,ɪnɪk'splɪkəb(ə)l;,ɪnek-;ɪn'eksplɪ-] 美[,ɪnɪk'splɪkəbl]

1. incapable of being explained or accounted for;: "inexplicable errors"; "left the house at three in the morning for inexplicable reasons"