invaluable◼◼◼(of great value) adjective [UK: ɪn.ˈvæ.ljʊəb.l̩] [US: ˌɪn.ˈvæ.ljəb.l̩]The Internet is an invaluable source of information. = Internet est une source d'information inestimable.
priceless◼◼◼(so precious as not to be sold at any price) adjective [UK: ˈpraɪ.sləs] [US: ˈpraɪ.sləs]These paintings are priceless. = Ces tableaux sont inestimables.