Un‐cer″tain (ŭn‐sẽr″tĭn), a. [Pref. un- not + certain. Cf. Incertain.] 1. Not certain; not having certain knowledge; not assured in mind; distrustful. Chaucer.
Man, without the protection of a superior Being,... is uncertain of everything that he hopes for. Tillotson.
2. Irresolute; inconsonant; variable; untrustworthy; as, an uncertain person; an uncertain breeze.
O woman! in our hours of ease,
Uncertain, coy, and hard to please! Sir W. Scott.
3. Questionable; equivocal; indefinite; problematical. “The fashion of uncertain evils.” Milton.
From certain dangers to uncertain praise. Dryden.
4. Not sure; liable to fall or err; fallible.
Soon bent his bow, uncertain in his aim. Dryden.
Whistling slings dismissed the uncertain stone. Gay.
Syn. — See Precarious.