unknown

Meanings

1. 1
   adj

   Not known; not discovered or identified.

   The cause of the fire is still unknown.

2. 2
   adj

   Not famous; not known to many people.

   The film starred a young, unknown actor.

3. 3
   noun

   Something that is not known or understood.

   Astronauts venture into the unknown every time they leave Earth.

From Middle English *unknowen, *uniknowen, uniknowe, from Old English unġecnāwen (“unknown”), equivalent to un- + known.

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