n. The character or state of being unquestionable; also, that which cannot be questioned or doubted; a certainty.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the quality of being beyond question or dispute or doubt
Word Usage
"A new dimension to McCain's "unquestionability" has been added to his campaign now that Alaska Governor Sarah Palin has joined the ticket, with pundits and anchors calling"