invaluable
Translation
invaluable, priceless, extremely useful
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
((...)) to (sb./sth.) extremely useful to (sb./sth.) Her help was invaluable to the project.
an invaluable ((noun)) an extremely useful (noun) This book is an invaluable resource.
Similar Words
Synonyms: priceless, precious; Antonyms: worthless, useless
Etymology
From 'in-' (not) + 'valuable'. The prefix 'in-' here acts as an intensifier, meaning 'not able to be valued' or 'beyond value', not 'not valuable'.
Memory Tips
Be careful! 'Invaluable' means extremely valuable, NOT 'not valuable'. It's a common mistake.