unknown
adjectiveUK /ʌnˈnəʊn/
US /ʌnˈnoʊn/
Not known or not familiar to anyone.
The name of the new student is still unknown.
OTHER MEANINGS
2. A person or thing that is not known.
The team faced an unknown in the final match.
3. Not famous or not well known.
She was an unknown singer before the contest.
4. Not known because it has not been discovered yet.
Scientists explored an unknown part of the ocean.