Definitions from Wiktionary (unknown quantity)
▸ noun: (idiomatic) A person or thing whose nature or value is a mystery.
▸ noun: Used other than figuratively or idiomatically: see unknown, quantity.
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▸ noun: (idiomatic) A person or thing whose nature or value is a mystery.
▸ noun: Used other than figuratively or idiomatically: see unknown, quantity.
Similar:
unknown,
mystery,
something or other,
person unknown,
mystery bag,
unmystery,
incognita,
random,
darkness,
closed book,
more...
Opposite:
Phrases:
▸ Words similar to unknown quantity
▸ Usage examples for unknown quantity
▸ Idioms related to unknown quantity
▸ Wikipedia articles (New!)
▸ Words that often appear near unknown quantity
▸ Rhymes of unknown quantity
▸ Invented words related to unknown quantity