unmatchable

English

un- +‎ matchable

unmatchable (comparative more unmatchable, superlative most unmatchable)

Unable to be matched.
- 1995, V. Balakrishnan, Network Optimization (page 228)
  An edge in a graph which has a perfect matching is an unmatchable edge if no perfect matching in the graph contains that edge.
Uniquely good; not approached by anything else in quality or excellence.
- 2007 January 2, Allan Kozinn, “Celebrating Movie Musicals That Are Never Out of Date”, in New York Times‎:
  Yes, the originals were fantastic, perhaps even unmatchable.