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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31. The side-effects of the drug are as yet unknown .
32. He was trying, for some unknown reason, to count the stars.
33. In algebra, the sign X usually denotes an unknown quantity.
34. Yesterday's riot broke out at the instigation of an unknown politician.
35. The crowd cheered on the unknown Tunisian, hoping for a fairy-tale ending to the race.
36. The championship was won by a complete unknown.
37. The precise cause of the disease is unknown.
38. The letter had come from an unknown mischief-maker.
39. He is an unknown quantity for his rivals.
40. Imagination bodies forth the forms of things unknown.
41. Gold was totally unknown to their civilization.
42. An unknown number of people were killed.
43. The authorship of the poem is unknown.
44. The leading role is played by a complete unknown.
45. The astronauts began their journey into the unknown.
46. This drug was practically unknown in Britain.
47. The author is virtually unknown outside Poland.
48. Explorers penetrated deep into unknown regions.
49. A generation ago(sentencedict.com), home computers were virtually unknown.
50. Unknown attackers riddled two homes with gunfire.
50. Wish you will love sentencedict.com and make progress everyday!
51. The new law is a jump into the unknown.
52. His whereabouts were quite unknown during this period.
53. Stipes wagered all his money on an unknown horse.
54. The scientist was faced with many unknown factors.
55. The painting was ascribed to an unknown artist.
56. The disease is as yet unknown in Europe .
57. Her present whereabouts are still unknown.
58. He was virtually unknown before running for office.
59. Those explorers gallantly adventured on unknown seas.
60. Motherhood was for her a journey into the unknown.
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.