Unknown definition
- Not in the knowledge, understanding, or acquaintance of someone; unfamiliar (to)
- Not discovered, identified, determined, explored, etc.
A problem unknown in earlier times.
An unknown artist.
Investigating the unknown.
This case has many unknowns.
Received flowers from an unknown admirer.
An actor no one has ever heard of who is trying to get into the movie business is an example of an unknown.
In the equation "x+2 = 4," x is an example of an unknown.
A brand new taste that you have never tasted before is an example of something that you would describe as an unknown taste.
Cast an unknown in the starring role.
The tomb of the unknowns.