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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.
I left the meeting feeling anxious, and uncertain about what to do next.
Greg was uncertain how to respond to this odd request.
This is the British English definition of uncertain. View American English definition of uncertain.
a sweet brown powder that tastes like chocolate and is made from the seeds of a Mediterranean tree