Source : Webster's Revised Unabridged Dictionary (1913)

Indiscernible \In`dis*cern"i*ble\, a. [Pref. in- not +
   discernible: cf. F. indiscernable.]
   Not to be discerned; imperceptible; not discoverable or
   visible.

         Secret and indiscernible ways.           --Jer. Taylor.
   -- {In`dis*cern"i*ble*ness}, n. -- {In`dis*cern"i*bly}, adv.