Obscure
Mysterious
Unfamiliar
Alien
Secret
Undiscovered
...
If something is unknown it is not known by someone or something.
One approach of identifying something that is unknown is to observe. Observation will help reveal the physical appearance of something that is unknown.
The antonym of unknown is known. When you know something then you won't not know that thing that you know. Unknown means to not know something.
something that is unknown
You cannot portray identification upon something unknown. It must be something known only to the user, or be something the user is (such as a fingerprint, retina scan or DNA sample) or something the user has (such as an ID card).
Something Unknown Is Doing We Don't Know What - 2009 is rated/received certificates of: Netherlands:AL
Unknown something.
an unknown. eg x+1=3 means something plus 1=3. the unknown, or 'something' must be 2. therefore x=2
faith
How can you have an unknown innovation? Innovation means to make something new, ie to create a known from the unknown. So, by definition an innovation should be known.
that fact is unknown and will remain to be unknown until britney herself says something about it, not the press
The word "something" is a pronoun. It is used to refer to an unspecified or unknown thing.