unknown quantity

noun

Definition of unknown quantity

: someone or something whose abilities or characteristics are not yet known If you've never been published before, you're an unknown quantity, so you're going to have difficulty selling your first novel.

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“Unknown quantity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unknown%20quantity. Accessed 5 Dec. 2020.

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