The phrase "unrivalled quality" means that something is of such high quality that it is unmatched and cannot be surpassed by any other. Full definition
Extraordinary material combinations and unrivalled quality of workmanship define the premium ambience on board the new BMW 4 Series Gran Coupé. (ausmotive.com)
With this license, California residents can now benefit from the unrivalled quality of deCODE products for understanding risk and, working with their physicians, empowering the prevention of common diseases. (decode.com)