Available Definitions:
1) a. - Not certain; not having certain knowledge; not assured in mind; distrustful.
2) a. - Irresolute; inconsonant; variable; untrustworthy; as, an uncertain person; an uncertain breeze.
3) a. - Questionable; equivocal; indefinite; problematical.
4) a. - Not sure; liable to fall or err; fallible.
5) a. - To make uncertain.