speculate

verbs

to believe especially on uncertain or tentative grounds
"Scientists supposed that large dinosaurs lived in swamps"
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talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion
"We were speculating whether the President had to resign after the scandal"
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is a type of (narrower)
think logically
"The children must learn to reason"
reflect deeply on a subject
"I mulled over the events of the afternoon"; "philosophers have speculated on the question of God for thousands of years"; "The scientist must stop to observe and start to excogitate"
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invest at a risk
"I bought this house not because I want to live in it but to sell it later at a good price, so I am speculating"
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