Simple past tense and past participle of theorise. (verb)
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Use "theorised" in a sentence
"On the other hand, I don't think that is the main 'theorised' benefit behind A2 milk at all."
"If you read further about it you will see that the main 'theorised' benefits (still unproven) are related to autoimmune responses which certainly have nothing to do with inherited lactose intolerance at all, which is an inability to digest lactose usually because genetically you cannot produce lactase enzyme."
"The court heard that the woman had "theorised" that marriage did not have to be based on sexual fidelity, but had never put the idea into practice."