Etymology

priceless

price·less
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Today it means: Without a price assigned; unpriced. Full definition →

First used 1590s
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The story

From price + -less (“lacking, without”).

First known use, by meaning

  • from 1590s So precious as not to be obtainable or sold at any price.
  • from 1907 Very amusing; hilarious.

Etymology from Wiktionary, CC BY-SA 4.0.