Definition from macmillandictionary.com
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The origin of the word is uncertain.
It is uncertain how they entered the property.
Despite recent research, the precise mechanism of the virus remains uncertain.
The economic outlook was beginning to look uncertain.
The industry as a whole faces a very uncertain future.
I left the meeting feeling anxious, and uncertain about what to do next.
Greg was uncertain how to respond to this odd request.
Sara seemed more self-assured: no longer young and uncertain, but a confident professional woman.