priceless

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[edit] English

priceless (comparative more priceless, superlative most priceless)

So precious as not to be sold at any price.
Treasured; held in high regard.
- 2011 October 1, Saj Chowdhury, “Wolverhampton 1 - 2 Newcastle”, BBC Sport:
  
  Alan Pardew's current squad has been put together with a relatively low budget but the resolve and unity within the team is priceless.
(informal) Hilariously amusing.

so precious as not to be sold at any price