Webster's English Dictionary

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impossible

im.pos.si.ble \(')im-'pa:s-*-b*l\ \-ble-\ aj [ME, fr. MF & L; MF, fr. L 
   impossibilis, fr. in- + possibilis] possible 1a: incapable of being or of 
   occurring  1b: felt to be incapable of being done, attained, or fulfilled : 
   insuper ably difficult : HOPELESS 2a: extremely undesirable : UNACCEPTABLE  
   2b: markedly difficult to deal with : OBJECTIONABLE  - im.pos.si.ble.ness n