1. 
[syn: countless, infinite, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable]
The Collaborative International Dictionary of English v.0.48:
Unnumerable \Un*nu"mer*a*ble\, a.
   Innumerable. [Obs.] "An unnumerable multitude." --Udall.
   [1913 Webster]
WordNet (r) 3.0 (2006):
unnumerable
    adj 1: 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, multitudinous,
           myriad, numberless, uncounted, unnumberable,
           unnumbered, unnumerable]