invaluable

Definitions

Extremely useful; indispensable.

Of such great value that the worth cannot be calculated.

Examples

Her experience in the field proved to be invaluable during the crisis.

The mentor provided invaluable advice that helped me launch my career.

Access to the private archives was an invaluable resource for my historical research.

Synonyms

priceless inestimable precious irreplaceable indispensable valuable treasured

Antonyms

worthless valueless useless cheap expendable trivial insignificant