Noah Webster's New International Dictionary of the English Language

1. (a.) Not conscious; having no consciousness or power of mental perception; without cerebral appreciation; hence, not knowing or regarding; ignorant; as, an unconscious man.

2. (a.) Not known or apprehended by consciousness; as, an unconscious cerebration.

3. (a.) Having no knowledge by experience; -- followed by of; as, a mule unconscious of the yoke.