Webster's Revised Unabridged Dictionary · 1913

Agnostic

Agnostic ({not transcribed}) , adjective

[Greek 'a priv. + {not transcribed} knowing, {not transcribed} to know.]

Professing ignorance; involving no dogmatic; pertaining to or involving agnosticism.

Agnostic , noun

One who professes ignorance, or denies that we have any knowledge, save of phenomena; one who supports agnosticism, neither affirming nor denying the existence of a personal Deity, a future life, etc.