conjecture
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/kənˈdʒektʃər/
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/kənˈdʒektʃə(r)/
a guess or theory made without strong evidence
Everyone's talking about why the cafe closed, but it's all just conjecture.
the process of guessing based on incomplete information
Trying to guess his reason for leaving is just pure conjecture.
to make a guess when you don't know all the facts
He could only conjecture what was happening inside the meeting.