Definition of uncertain
1a
: not known beyond doubt : dubious
an uncertain claim
b
: not having certain knowledge : doubtful
remains uncertain about her plans
c
: not clearly identified or defined
a fire of uncertain origin
3
: indefinite, indeterminate
the time of departure is uncertain
4
: not certain to occur : problematical
his success was uncertain
5
: not reliable : untrustworthy
an uncertain ally
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Merriam-Webster unabridged
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The first known use of uncertain was in the 14th century
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