priceless

the word 'priceless' is a straightforward compound formed within english from the native elements 'price' and the suffix '-less'. the root 'price' entered english via old french from latin 'pretium', meaning 'money, value, reward', which itself is traced back to a proto-indo-european root meaning 'to sell'. the suffix '-less' is a common germanic formative from old english, signifying absence. the literal meaning, 'without a price', originally suggested something so valuable that no price could be set upon it, a sense that remains primary. through a figurative extension, this idea of being beyond valuation evolved in colloquial use to describe something so uniquely good or amusing that it defies ordinary measure, giving rise to the secondary, informal meaning.

Structure: price (value) + less (without) price (from old french 'pris', meaning 'value, reward', of latin origin) + less (from old english '-lēas', an adjective-forming suffix meaning 'devoid of, free from').