ˈprīslə̇s adjective
1.
a. : having a value beyond any price : too valuable to be appraised, estimated, or adequately appreciated
the priceless boon of good health
b. : excessively high-priced
a sale of priceless jewels
2.
a. : of intangible value : having worth in terms of other than market value
such a pair of well-worn comfortable walking shoes is priceless
b. : having no market value : unsalable
3. : surprisingly amusing, odd, or absurd
Synonyms: see costly