unknown

Definitions

Not known or familiar; not identified or ascertained.

A person or thing that is not known or recognized.

A variable or quantity whose value is not yet determined.

Examples

The cause of the mysterious fire remains unknown to the investigators.

She ventured into the unknown territory with nothing but a map and a compass.

The identity of the anonymous donor is still unknown to the public.

Synonyms

unidentified anonymous unfamiliar obscure nameless unexplored hidden

Antonyms

known familiar famous identified recognized well-known celebrated