Synonyms of 'theorize'
We can theorize about their minds by watching them behave.
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When you conjecture, you form an opinion or reach a conclusion on the basis of information that is not certain or complete.
This may or may not be true; we are all conjecturing here.
I can only guess what it cost him to tell you the truth.
Thesaurus for theorize from the Collins English Thesaurus
If you theorize that something is true or theorize about it, you develop an abstract idea or set of ideas about something in order to explain it.