Source : Webster's Revised Unabridged Dictionary (1913)

Inestimable \In*es"ti*ma*ble\, a. [L. inaestimabilis: cf. F.
   inestimable. See {In-} not, and {Estimate}.]
   Incapable of being estimated or computed; especially, too
   valuable or excellent to be measured or fully appreciated;
   above all price; as, inestimable rights or privileges.

         But above all, for thine inestimable love. --Bk. of
                                                  Com. Prayer.

         Science is too inestimable for expression by a money
         standard.                                --Lyon
                                                  Playfair.

   Syn: Incalculable; invaluable; priceless.

Source : WordNet®

inestimable
     adj : beyond calculation or measure; "of incalculable value"; "an
           incomputable amount"; "jewels of inestimable value";
           "immeasurable wealth" [syn: {incomputable}, {immeasurable}]