invaluable
Translation
extremely useful, priceless
Examples
Her help was invaluable to the project.
Her help was invaluable to the project.
This book is an invaluable resource for students.
This book is an invaluable resource for students.
Grammar Patterns
invaluable ((to sb./sth.)) extremely useful to (sb./sth.) Her help was invaluable to the project.
Similar Words
Synonyms: priceless, precious, essential; Antonyms: worthless, useless
Etymology
From the prefix 'in-' (not) + 'valuable'. It means 'not able to be valued' because its worth is too great, not 'without value'.
Memory Tips
Think 'IN-capable of being VALUed'. This helps distinguish it from meaning 'not valuable'.