uncertain

Adjective

WordNet 3.0

lacking or indicating lack of confidence or assurance“uncertain of his convictions”“unsure of himself and his future”“moving with uncertain (or unsure) steps”“an uncertain smile”“touched the ornaments with uncertain fingers”Synonyms: unsure incertain
not established beyond doubt; still undecided or unknown“an uncertain future”“a manuscript of uncertain origin”“plans are still uncertain”“changes of great if uncertain consequences”“without further evidence his story must remain uncertain”
not established or confirmed“his doom is as yet unsealed”Synonyms: unsealed
not certain to occur; not inevitable“everything is uncertain about the army”“the issue is uncertain”
subject to change“a changeable climate”“the weather is uncertain”“unsettled weather with rain and hail and sunshine coming one right after the other”Synonyms: changeable unsettled
not consistent or dependable“an uncertain recollection of events”“a gun with a rather uncertain trigger”
ambiguous (especially in the negative)“she spoke in no uncertain terms”

Uncertain \Un*cer"tain\ ([u^]n*s[~e]r"t[i^]n), a. [Pref. un- not + certain. Cf. Incertain.]

1.Not certain; not having certain knowledge; not assured in mind; distrustful. --Chaucer. [1913 Webster]

Man, without the protection of a superior Being, . . . is uncertain of everything that he hopes for.— Tillotson.[1913 Webster]

2.Irresolute; inconsonant; variable; untrustworthy; as, an uncertain person; an uncertain breeze. [1913 Webster]

O woman! in our hours of ease, Uncertain, coy, and hard to please!— Sir W. Scott.[1913 Webster]

3.Questionable; equivocal; indefinite; problematical. "The fashion of uncertain evils." --Milton. [1913 Webster]

From certain dangers to uncertain praise.— Dryden.[1913 Webster]

4.Not sure; liable to fall or err; fallible. [1913 Webster]

Soon bent his bow, uncertain in his aim.— Dryden.[1913 Webster]

Whistling slings dismissed the uncertain stone.— Gay.[1913 Webster]

Syn: See Precarious. [1913 Webster]

Uncertain \Un*cer"tain\, v. t. [1st pref. un- + certain; or fr. uncertain, a.] To make uncertain. [Obs.] --Sir W. Raleigh. [1913 Webster]