Webster's English Dictionary

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impenetrable

im.pen.e.tra.ble \(')im-'pen-*-tr*-b*l\ \-ble-\ aj [ME impenetrabel, fr. MF 
   impenetrable, fr. L impenetrabilis,]fr. in- + penetrabilis penetrable 1a: 
   incapable of being penetrated or pierced  1b: inaccessible to knowledge, 
   reason, or sympathy : IMPERVIOUS  2: incapable of being comprehended : 
   INSCRUTABLE  3: having the property of impenetrability  - 
   im.pen.e.tra.ble.ness n