|ənsər|pasəbəl, -paas-, -pais-, -pȧs- adjective
Etymology: un- (I) + surpass + -able
: incapable of being surpassed : not to be exceeded
was hailed with unsurpassable enthusiasm — Fred Whishaw
unsurpassable standards of workmanship
unsurpassable skill
• un·sur·pass·ably -blē, -li adverb