invaluable

/IH0 N V AE1 L Y AH0 B AH0 L/
adjective
  1. 1

    Of great value; costly, precious, priceless.

  2. 2

    Very useful.

  3. 3

    Beyond calculable or appraisable value; of inestimable worth

Source: https://en.wiktionary.org/wiki/invaluable