an unknown quantity Meaning If a thing or a person is an unk | English Language

an unknown quantity

Meaning
If a thing or a person is an unknown quantity, not much is known about them.

For example

The Saints have signed a new player, but he's an unknown quantity at this stage as very few people have seen him play.

We've all heard stories about a great new Ferrari engine, but it's still an unknown quantity as far as racing is concerned.
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