Definitions

1. adjective

not known or recognized; not identified or classified.

“The cause of the accident remained unknown for several hours.”

2. noun

a person or thing that is not known or identified.

“The police were searching for an unknown person who had been seen in the area.”

3. verb

to make someone or something unknown or unrecognizable.

“The new law will unknown the identities of the whistleblowers.”

4. adverb

in a way that is not known or recognized; in a way that is not identified or classified.

“The effect of the new policy was unknown at the time.”