Her advice on the project was simply invaluable.The document provides invaluable insights into ancient cultures.Volunteers play an invaluable role in community programs.
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Valueless
/ˈvaljʊləs/
Something that is not worth anything or has no financial or practical value.
Examples:
The trinket was pretty but ultimately valueless.Many outdated gadgets are now deemed valueless.The offer seemed promising but was ultimately valueless.
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Ways to tell them apart:
Valueless means something has no worth or value; think of it as having no value at all.
Invaluable means something is so valuable that its worth is beyond measure. A trick to remember this is by associating in in invaluable with infinite value.
Though valueless and invaluable both discuss value, they have nearly opposite meanings, so be careful when choosing the correct one.