adjective \(ˌ)in-ˈval-yə-bəl, -yə-wə-bəl, -yü(-ə)-bəl\

: extremely valuable or useful

Full Definition of INVALUABLE

:  valuable beyond estimation :  priceless <providing invaluable assistance>
in·valu·able·ness noun
in·valu·ably \-blē\ adverb

Examples of INVALUABLE

  1. Their help has been invaluable to us.
  2. <the list of likely donors proved to be invaluable to our fund-raising efforts>
  3. Unfortunately, though, Sally does not respond to lithium, which has been invaluable for many patients with manic-depressive illness … —Oliver Sacks, New York Review of Books, 25 Sept. 2008


1in- + value, verb + -able
First Known Use: 1576


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