agnostic (adj) - holding the view that absolute truth or ultimate certainty, especially certainty of the existence of a deity, is unattainable; lacking a clear preference or opinion on a matter [ag-nos-tik]
BREAKDOWN: A- (not) + GNO- (know) + -STIC (characterized by)
an agnostic is a thinker who disclaims any knowledge of an ultimate reality or divinity
agnosticism is a theory that does not deny the existence of God, but denies the possibility of knowing God
See also: prognosticate
“I do not consider it an insult, but rather a compliment to be called an agnostic. I do not pretend to know where many ignorant men are sure - that is all that agnosticism means.” —Clarence Darrow