I hope that this is a good forum to post the query below, and please excuse me if it is not -- this is my first visit.

I am looking for a noun that describes a state of not being surpassable or exceedable (similar to how "impossibility" describes the state of not being possible). Is there such a word? "Unsurpassability" seems very awkaward.


Could insuperable fit what you have in mind?

incapable of being surmounted, overcome, passed over, or solved — in·su·per·a·bly adverb

  • This is a perfect word for what I am trying to describe (a mathematically-provable limit). Thank you! But is "insuperability" a word? Here is a fragment my sentence: "The ______ of limit X implies..." I am trying to be terse. – M.B.M. Jul 18 '14 at 6:59
  • 1
    Yes it is, thefreedictionary.com/Insuperability – user66974 Jul 18 '14 at 7:02
  • But why would you say 'insuperable' if you meant 'unsurpassable'? – WS2 Jul 18 '14 at 7:06
  • As I mentioned in my question, "unsurpassability" doesn't sound right... – M.B.M. Jul 18 '14 at 8:09
  • 'The ______ of limit X ...' is tautologous. Why not 'the fact that the limit X exists ...' / 'X being an upper / a lower bound ...'? – Edwin Ashworth Jul 18 '14 at 16:42

Depends on the context you want to use the word in



eminent beyond or above comparison; "matchless beauty"; "the team's nonpareil center fielder"; "she's one girl in a million"; "the one and only Muhammad Ali"; "a peerless scholar"; "infamy unmatched in the Western world"; "wrote with unmatchable clarity"; "unrivaled mastery of her art" -the free dictionary


beyond comparison; matchless or unequaled: incomparable beauty. -dictionary.com

The Free Dictionary also gives the following as synonynms and related words:

matchless, nonpareil, one and only, peerless, unrivaled, unrivalled, unmatched, one, incomparable, uncomparable

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