adj

invaluable

ihn-VAL-yoobl

adj

So valuable that its worth can't be measured; extremely useful or precious.

"Her advice was invaluable during the negotiations."

"The old maps proved invaluable to the researchers."

How to Use Invaluable

Learner’s notes

In plain EnglishExtremely useful or valuable — despite the "in-" prefix, it means the opposite of worthless.

Common mistake

Don't confuse with "worthless" — invaluable means the opposite: too valuable to put a price on.

Common pairings

invaluable help invaluable experience prove invaluable

more invaluable comparative, most invaluable superlative

Study it as flashcards or scroll it in Flow — saved to your collection.

Can you complete this real example?

Her advice was _____ during the negotiations.

From in- + valuable, on the pattern of "priceless" — literally meaning too valuable to price, not "lacking value."

able fable cable table sable gable viable liable stable unable usable enable