You searched for: “invaluable
invaluable (adjective), more invaluable, most invaluable
1. Extremely costly or precious; inestimable worth: The paintings in Rose's home were invaluable and priceless because they were all originals by famous painters.
2. Referring to something which is very useful: indispensible: In her kitchen, Natasha thought that her dishwasher was an invaluable appliance and she would never want to miss it!
This entry is located in the following units: -able (page 23) valid-, val-, vale-, -vail, -valent, -valence (page 3)