From Biology-Online Dictionary | Biology-Online Dictionary


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

Synonym: See precarious.

Origin: Pref. Un- _ certain. Cf. Incertain.