(1):

(a.) To make uncertain.

(2):

(a.) Not sure; liable to fall or err; fallible.

(3):

(a.) Irresolute; inconsonant; variable; untrustworthy; as, an uncertain person; an uncertain breeze.

(4):

(a.) Questionable; equivocal; indefinite; problematical.

(5):

(a.) Not certain; not having certain knowledge; not assured in mind; distrustful.