Antonym: known. Similar words: flunk, skunk, chunk, trunk, know, sunken, debunk, knob. Meaning: [ʌnˈnəʊn] 
n. 1. an unknown and unexplored region 2. anyone who does not belong in the environment in which they are found 3. a variable whose values are solutions of an equation. adj. 1. not known 2. being or having an unknown or unnamed source 3. not known to exist 4. not famous or acclaimed 5. not known before.
n. 1. an unknown and unexplored region 2. anyone who does not belong in the environment in which they are found 3. a variable whose values are solutions of an equation. adj. 1. not known 2. being or having an unknown or unnamed source 3. not known to exist 4. not famous or acclaimed 5. not known before. 
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211. It is no safe wading in unknown water.
212. PLAYER. Unknown. Enigmatic . Signs cloudy. Unproven. Heed.
213. Fossil found in Yukon are of unknown species.
214. He bowed in homage to the Unknown Soldier.
215. Mere amateurs in 2009 will make ornithological history in China by discovering birds unknown to science.
216. President Nixon devalues the dollar, journeys to Peking and Moscow; the future remains unknown.
217. Singapore is the second unknown quantity on the calendar this year after Valencia.
218. An unknown actor penciled in to play the leading role.
219. Beyond the currently unknown are the things that are inherently unknowable.
220. The algorithms then estimate F, B[sentencedict.com], and for all pixels the unknown region.
221. John is a possibility for the job, but he is still an unknown quantity.
222. Standard cell intercomparisons require measuring the potential difference between a reference and an unknown standard cell.
223. This unknown, untried dealmaker applied for and received a 40 - year tax abatement from the City.
224. Following a recent refit, these dishes were replaced by three large radomes housing unknown equipment.
225. Whether the DPJ, an unknown quantity , can make a better running the economy open to question.
226. I don't know what the new man will do; he's still an unknown quantity.
227. They think that it could be a huge, unknown kind of sea slug.
228. For if I pray in an unknown tongue , my spirit prayer, but my understanding is unfruitful.
229. China was the big unknown quantity until l 953, when a census was carried out.
230. People still use old agricultural techniques as scientific agriculture is costly and even unknown.
231. What do you think is 6's biggest unknown ( hidden ? ) quirk ( weird habit ) ?
232. You may be serving in obscurity in some small place,[www.Sentencedict.com] feeling unknown and unappreciated.
233. Debrecen were an unknown quantity and they played very defensively, which is their right.
234. But for unknown reasons, in the remaining cases the twisting did not presage a flare.
235. All I could do was to gaze steadily, vacantly at my unknown visitor.
236. ERROR: An unknown error occurred while checking for circular references and unreachable steps.
237. Regulus survived only a few days after defying Voldemort ( reason unknown ) ( HBP 6 ).
238. Always a new way of bribing unknown and maybe nonexistent forces.
239. Across the river in Arlington, thethe Unknown Soldier stands the dim, grave majestic Arlington National Cemetery.
240. This media contains unknown or unreadable data. The program settings prevent overwrite.
More similar words: flunk, skunk, chunk, trunk, know, sunken, debunk, knob, drunken, knock, junk mail, hunker down, know about, knock out, knock off, well-known, well known, knock down, knowledge, doorknob, hunkered down, acknowledge, acknowledgement.