Extremely useful or precious; so valuable that its worth cannot be measured in money.
From *in-* “not” and *valuable* “having value.” It literally means “not able to be valued,” meaning too great to put a price on.
In English, “invaluable” doesn’t mean “worthless”—it actually means “so valuable you can’t put a price on it.” It’s a perfect example of a prefix that flips the meaning in a surprising direction.
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