In the words of Donald Rumsfeld, something that we don't know that we don't know. C'mon Donald.
Each year, we uncover a few more of these unknown unknowns.
by Bushmonkey March 21, 2006
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These are things that you don't know that you don't know, as opposed to things that you know you don't know. Coined by Donlad Rumsfeld, former US Secretary of Defense.
Boss: Is there anything that will cause this system implementation to fail?
You: That's an unknown unknown!
by seven852 September 20, 2009
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1. Not widely known
2. Unfamiliar.
3. An unknown number.
4. A favorite answer of Kiko's
Choo: When will we do the art contest?
Kiko: Unknown.
Choo: >.<
by Kiko February 2, 2004
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Unknowning, is a person, usually named Sarah, that has no idea that marshmallows actually taste better than whipped cream in hot chocolate. This person is often very confused in life, and must be led to the true greatness of the universe.
Sarah: "No! whipped cream is better than Marshmallows in hot chocolate!"

(Sarah is very Unknowning. Obviously.)
by littlemiss_kate22 December 4, 2010
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The coolest Counter-Strike player and level designer ever.
"UNKNOWN just pwned you"
by Eric C January 28, 2005
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A race of beings that first appeared in Kingdom Hearts. Ansem was apparently one before he overtoke Riku's body. An unknown is not hard to spot, as they always wear a black, hooded rain coat and never show their faces unless forced to. Due to how they may be merely shells, they have also been known to be called NEO's or Non-Existent One's...
"Ansem?" - Goofy to Unknown
"That name sounds familiar..." -Unknown to Goofy
by Darkness Shade December 20, 2003
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Usually people at a party or job who you don't know; neighbors you don't know. Locals you meet while travelling.
The unknowns have taken over that place, I don't go there anymore.
by Gojai August 23, 2017
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