adj to make uncertain.
2. uncertain ·adj not sure; liable to fall or err; fallible.
3. uncertain ·adj questionable; equivocal; indefinite; problematical.
4. uncertain ·adj not certain; not having certain knowledge; not assured in mind; distrustful.
5. uncertain ·adj irresolute; inconsonant; variable; untrustworthy; as, an uncertain person; an uncertain breeze.