Source : Webster's Revised Unabridged Dictionary (1913)

Inexhaustible \In`ex*haust"i*ble\, a.
   Incapable of being exhausted, emptied, or used up; unfailing;
   not to be wasted or spent; as, inexhaustible stores of
   provisions; an inexhaustible stock of elegant words.
   --Dryden.

         An inexhaustible store of anecdotes.     --Macaulay.
   -- {In`ex*haust"i*ble*ness}, n. -- {In`ex*haust"i*bly}, adv.

Source : WordNet®

inexhaustible
     adj 1: that cannot be entirely consumed or used up; "an
            inexhaustible supply of coal" [syn: {unlimited}]
     2: incapable of being entirely consumed or used up; "an
        inexhaustible supply of coal" [ant: {exhaustible}]