priceless

Something priceless is incredibly valuable. It's so valuable that no one would ever want to sell it or be able to buy it.

Since a price is what it costs to buy something, priceless things cannot be bought; they're too valuable. People sometimes talk about "priceless treasures," which may actually have a price, though only a millionaire could afford buying them. More often, priceless things are things without a monetary value — like friendship, love, honor, etc. Parents call their children priceless, because they value them so much and obviously would never sell them.

Definitions of priceless
1

adj having incalculable monetary, intellectual, or spiritual worth

Synonyms:
invaluable
valuable
having great material or monetary value especially for use or exchange

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