unknown

Definition:
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.
4. Not known.
5. Being or having an unknown or unnamed source.
6. Not known to exist.

Use 'unknown' in a sentence:

1. I guess that there's probably some demanding work schedule, or social anxiety around stepping up to help for an unknown sport ．
2. She had known Max for some years now, but he was still pretty much an unknown quantity.
3. The motive for the killing is unknown.
4. The letter had come from an unknown mischief-maker.
5. My husband, for some unknown reason, suggested that I loved my birds more than him: as if I would.
6. The contract was awarded to a previously unknown company.
7. He was trying, for some unknown reason , to count the stars.
8. Ignorance of people brings fear, fear of the unknown.
9. I could not understand how someone with so many awards could be unknown to me.
10. The timing of the attack, and its motivations, are unknown.
11. Why this pigment is there and what it might do was unknown.
12. It's dark and unknown.
13. Unknown attackers riddled two homes with gunfire.
14. A hundred years ago coronary heart disease was virtually unknown in Europe and America.
15. The author does imply this by talking about unknown species.
16. In Juan's world, the unknown and undiscovered was vast and marvelous.
17. His whereabouts have been utterly unknown so far.
18. I remember the fear and the panic of the unknown.
19. A hundred years ago coronary heart disease was virtually unknown in America.
20. The condition is practically unknown outside psychiatry clinics.
21. He was an unknown writer.
22. His whereabouts are/ is still unknown.
23. Retailers are taking no chances on unknown brands.
24. A previously unknown extremist group has said it carried out Friday's bomb attack.
25. It is not unknown for valuable display items to go, ahem, missing.
26. Bass may have perished there after years of wearisome and unknown labour.
27. The exact location of the plane crash is still unknown.
28. A little bravery can result in the possibility of success when confronted with something unknown.
29. Exactly which bacteria cause the infection is still unknown.
30. The fate of the three men is unknown.
31. He is an unknown quantity for his rivals.
32. The authorship of the poem is unknown.
33. The author is virtually unknown outside Poland.
34. This spaceship is about to start an exciting voyage into an unknown world.
35. The verdict was murder by a person or persons unknown.
36. It urges us to explore the unknown domain of the universe.
37. How did you expect us to proceed on such a perilous expedition, through unknown terrain.
38. Unknown to me, he had already signed the agreement.
39. Unknown thieves had forced their way into the apartment.
40. An unknown number of demonstrators were arrested.
41. He was trying, for some unknown reason, to count the stars.
42. The man's identity remains unknown.
43. Once more he's making a leap into the unknown without a plan.
44. Thanks to the automobile, Americans soon had a freedom of movement previously unknown.
45. The actual cause of this quake is still unknown.
46. The immediate cause of death is unknown.
47. A young unknown played the leading role.
48. The disease is as yet unknown in Europe.