The invaluable definition surprises many learners: invaluable means extremely useful or precious, so valuable that no one could put an exact figure on it. It does not mean "not valuable", even though the prefix in- often means "not".
Think of it this way: the value is beyond measuring. When a colleague's help saves your project, you might say their help was invaluable. Below are the full definition of invaluable, the reason for the odd prefix, example sentences and the words people confuse it with.
Entry at a glance
Meaning
Extremely useful or important; too precious to measurePart of speech
AdjectivePronunciation
in-VAL-yoo-uh-buhl (four or five syllables, stress on VAL)Word forms
invaluably (adverb)Origin
Recorded from the 1570s: in- (not) + value (to estimate worth) + -able, so "cannot be valued"Opposite
Worthless, useless, valuelessRegister
Neutral to formal; common in letters, reviews and thank-you notes
Invaluable definition in plain words
Use invaluable when something helps so much that its worth is hard to measure. It is a strong word of praise and is mostly used for:
- help and support: your advice was invaluable
- experience and skills: invaluable experience, an invaluable skill
- people: she is invaluable to the team
- tools and sources: an invaluable guide, an invaluable resource
It usually describes usefulness rather than money. A diamond ring is valuable or expensive; a friend who drives you to hospital at night is invaluable.
Why does in- not mean not here?
The prefix does mean "not", but it attaches to the verb value, meaning to estimate worth. So the word first meant "not able to be valued", in the sense that the worth is too high to estimate. English recorded it with this meaning in the 1570s.
For a while English also used invaluable in the opposite sense, "without value", but that use faded long ago. Today only the praising sense is standard. Priceless works the same way: without a price because no price is high enough.
Invaluable vs valuable vs valueless
| Word | Meaning | Example |
|---|---|---|
| Valuable | Worth a lot, often in money | a valuable painting |
| Invaluable | Worth so much it cannot be measured; extremely useful | invaluable feedback |
| Valueless | Worth nothing | a valueless old coin |
| Priceless | Too precious to sell; also very funny in casual speech | a priceless family photo |
So invaluable is stronger than valuable, not its opposite. If you need the true opposite, say worthless or useless.
Examples of invaluable in sentences
- The night nurse was invaluable during my father's first week home from surgery.
- Working at a small startup gave me invaluable experience in sales and support.
- A good map of the old city proved invaluable when our phones lost signal.
- Your notes from last semester were invaluable when I studied for the exam.
- The volunteers have played an invaluable role in cleaning up the beach.
A new manager writes to a retiring employee: Thank you for twenty years of invaluable work. She means the work mattered so much that no salary figure could capture it, which is exactly what the word is for.
Define invaluable: grammar and pairings
Invaluable is an adjective. You can use it before a noun (invaluable help) or after a verb such as be, prove or become (the training proved invaluable). Common patterns:
- invaluable to a person or group: invaluable to our students
- invaluable for a task: invaluable for beginners
- invaluable in a situation: invaluable in an emergency
- prove invaluable: become very useful later
Because it already means "beyond value", phrases like very invaluable or more invaluable sound odd to careful writers. Truly invaluable and absolutely invaluable are accepted for emphasis. The adverb invaluably is rare.
Where you meet the word
Invaluable is common in reference letters, award speeches, product reviews and job interviews. On a resume, phrases like gained invaluable experience are popular, though some recruiters find them overused, so back them up with a real result. In Indian and American English the word is used the same way.
Related words worth knowing include tangible, comprehensive and grateful. You can find more in our everyday vocabulary collection.
Frequently asked questions
Does invaluable mean not valuable?
No. Invaluable means extremely valuable or useful. The in- prefix means the worth cannot be measured because it is so great, not that there is no worth.
What is the opposite of invaluable?
The opposite is worthless, useless or valueless. Valuable is not the opposite; it is a milder version of the same idea.
Is invaluable a positive word?
Very much so: it counts as strong praise. You use it to thank someone or to stress how much a thing helped.
Can you say very invaluable?
It is better to avoid it, since invaluable already means beyond value. Say truly invaluable or simply invaluable instead.
Is invaluable the same as priceless?
They are close. Priceless is used more for objects and memories, and it can also mean very funny in casual speech. Invaluable is used more for help, skills and experience.
How do you pronounce invaluable?
Say in-VAL-yoo-uh-buhl, stressing VAL. In quick speech many people say in-VAL-yuh-buhl.