unsurpassable

Meanings

1. 1
   adj

   so excellent, great, or extreme that it cannot be surpassed

   The proof was admired for its unsurpassable clarity.

2. 2
   adj

   impossible to exceed or go beyond

   There is no unsurpassable maximum among the ordinary finite numbers.

Formed from un- ("not") + surpassable. Surpass comes through Middle French surpasser, from sur- ("over, beyond") + passer ("to pass").

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