unsurpassable

English

Etymology

un- +‎ surpassable

Adjective

unsurpassable (comparative more unsurpassable, superlative most unsurpassable)

1. Not surpassable; unable to be surpassed.
   • 1908, Kenneth Grahame, The Wind in the Willows

     On either side of them, as they glided onwards, the rich meadow-grass seemed that morning of a freshness and a greenness unsurpassable. Never had they noticed the roses so vivid, the willow-herb so riotous, the meadow-sweet so odorous and pervading.