Source : Webster's Revised Unabridged Dictionary (1913)

Unnumerable \Un*nu"mer*a*ble\, a.
   Innumerable. [Obs.] ``An unnumerable multitude.'' --Udall.

Source : WordNet®

unnumerable
     adj : too numerous to be counted; "incalculable riches";
           "countless hours"; "an infinite number of reasons";
           "innumerable difficulties"; "the multitudinous seas";
           "myriad stars"; "untold thousands" [syn: {countless}, {infinite},
            {innumerable}, {innumerous}, {myriad(a)}, {multitudinous},
            {numberless}, {uncounted}, {unnumberable}, {unnumbered}]