Last Updated
：2025/11/23
unknown quantity
（ plural ）
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(idiomatic) A person or thing whose nature or value is a mystery. / Used other than figuratively or idiomatically: see unknown, quantity.
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unknown quantity
The new candidate is something of an unknown quantity; no one knows how she'll perform under pressure.
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The new candidate is something of an unknown quantity; no one knows how she'll perform under pressure.
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