verb

1. To undo the process of knowing, to lose knowledge of something.

noun

1. A variable (usually x, y or z) whose value is to be found.

2. Any thing, place, or situation about which nothing is known; an unknown fact or piece of information.

3. A person of no identity; a nonentity

adjective

1. (sometimes postpositive) Not known; unidentified; not well known.

Synonyms: anonymous, obscure, unascertained, uncharted, undiscovered, unexplored, unfamiliar, unidentified