The Collaborative International Dictionary of English v.0.48:

Stanchless \Stanch"less\ (st[.a]nch"l[e^]s), a.
   1. Incapable of being stanched, or stopped.
      [1913 Webster]

   2. Unquenchable; insatiable. [Obs.] --Shak.
      [1913 Webster]