adjective beyond calculable or appraisable value; of inestimable worth; priceless:
an invaluable art collection; her invaluable assistance.
Origin: 1570–80; in-3 +
valuable, in obsolete sense “capable of valuation”
Related forms in·val·u·a·ble·ness, noun
in·val·u·a·bly, adverb
Synonyms
precious.
Antonyms
worthless.