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The friendship between these two girls is invaluable. The definition of invaluable is priceless or having value too great to measure. An example of invaluable is the sentimental worth of your great grandmother's wedding band. invaluable.
He was an invaluable source of information. This experience proved invaluable later on. Invaluable is not the opposite of valuable. If you want to say that an object has no value at all, you can say that it is worthless or not worth anything. The goods are often worthless by the time they arrive. I started collecting his pictures when they weren't worth anything.