Uncertain definition

ŭn-sûrtn
Not having sure knowledge.

An uncertain recollection of the sequence of events.

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Not known or established; questionable.

Domestic changes of great if uncertain consequences.

adjective
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Not determined; undecided.

Uncertain plans.

adjective
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The definition of uncertain is not definite or not confirmed.

An example of uncertain is if you are not sure what you are going to be doing tomorrow; uncertain schedule.

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Subject to change; variable.

Uncertain weather.

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Unsteady; fitful.

Uncertain light.

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Not definite or determined; vague.
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Liable to vary or change; not dependable or reliable.
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Not steady or constant; varying.
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Not surely or certainly known; questionable; problematic.
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Not sure or certain in knowledge; doubtful.
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1
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Tomorrow's weather is uncertain.

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Origin of uncertain