Inestimable

Part of speech: adjective (a.)

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.

Synonyms: Incalculable; invaluable; priceless.