The term "theorised" means to develop and present a theory or hypothesis about a topic. Its synonyms include, speculated, conjectured, postulated, hypothesized and proposed. These words can be used interchangeably depending on the context of the sentence or the specific connotation desired. For instance, "speculated" suggests a degree of uncertainty, while "postulated" has a more confident tone to it. "Hypothesized" is often used in scientific contexts, while "proposed" may be used in everyday discourse. It is important to choose the appropriate synonym for "theorised" based on the intended meaning of the sentence.