- unknown quantity,
- unknown soldier,
Origin of unknown
Examples from the Web for unknown
While Faal and Njie are in U.S. custody, the whereabouts of the other survivors is unknown.The Shadowy U.S. Veteran Who Tried to Overthrow a Country|Jacob Siegel|January 6, 2015|DAILY BEAST
The police suspect that the other unaccounted for 643,000 bitcoins, were removed from customer accounts via an unknown party.Japanese Bitcoin Heist ‘an Inside Job,’ Not Hackers Alone|Nathalie-Kyoko Stucky, Jake Adelstein|January 1, 2015|DAILY BEAST
Until recently, the hacker collective known as Lizard Squad was all but unknown.
I believe that my case is being interfered with by unknown elements inside Iran.An American Marine in Iran’s Prisons Goes on Hunger Strike|IranWire|December 18, 2014|DAILY BEAST
We are not concerned or jittered about an unknown candidate.
The common serpent was unknown to us; but with our voices alone we managed to make a formidable noise.Christmas Stories from French and Spanish writers|Antoinette Ogden
Determination and efficiency are not unknown in His Majesty's Navy.The Blocking of Zeebrugge|Alfred F. B. Carpenter
The defendant's whereabouts were unknown to us, your Honor, and the court allowed us to serve notice by publication.Lightnin'|Frank Bacon
The byssus is unknown to us, but the stuffs of Lyons are more valuable.A Philosophical Dictionary, Volume 1 (of 10)|Franois-Marie Arouet (AKA Voltaire)
To those who hold this opinion, the system of reverberating praise from one journal to another, must be unknown.The American Quarterly Review|Various
c.1300, "strange, unfamiliar" (of persons, places), from un- (1) "not" + past participle of know. Cf. Old English ungecnawen. In reference to facts, attested from early 14c. The noun meaning "unknown person" is recorded from 1590s.