Webster's Revised Unabridged Dictionary · 1913

Unknow

Unknow , transitive verb

[1st un- + know.]

1.
To cease to know; to lose the knowledge of. [Obsolete]
2.
To fail of knowing; to be ignorant of. [Obsolete]

Unknow , adjective

[See Un- not, Know.]

Unknown. [Obsolete]
French of Paris was to her unknow. — Chaucer