Definition of unknown quantity in English:

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unknown quantity

noun

A person or thing whose nature, value, or significance cannot be determined or is not yet known: the producers replaced her with an unknown quantity
More example sentences
  • The label Frankenfoods is, as always, the way to get press, and a decent metaphor for the ambiguous nature of the unknown quantity.
  • Morris is an enigmatic moviemaker, an unknown quantity in the filmmaker personality department.
  • When I questioned one member about this, he suggested that was because the committee knew the reformers well, while the landowners were an unknown quantity.
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