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uncertain (adj.)

c. 1300, "of indeterminate time or occurrence," from un- (1) "not" + certain (adj.). Meaning "not fully confident" is recorded from late 14c. (implied in uncertainty). Related: Uncertainly.

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Definitions of uncertain

uncertain (adj.)
lacking or indicating lack of confidence or assurance;
touched the ornaments with uncertain fingers
moving with uncertain (or unsure) steps
uncertain of his convictions
an uncertain smile
Synonyms: unsure / incertain
uncertain (adj.)
not established beyond doubt; still undecided or unknown;
without further evidence his story must remain uncertain
plans are still uncertain
a manuscript of uncertain origin
an uncertain future
changes of great if uncertain consequences
uncertain (adj.)
not certain to occur; not inevitable;
the issue is uncertain
everything is uncertain about the army
uncertain (adj.)
subject to change;
the weather is uncertain
Synonyms: changeable / unsettled
uncertain (adj.)
not consistent or dependable;
a gun with a rather uncertain trigger
an uncertain recollection of events
uncertain (adj.)
ambiguous (especially in the negative);
she spoke in no uncertain terms
uncertain (adj.)
not established or confirmed;
Synonyms: unsealed
From wordnet.princeton.edu