Predispositional is an uncommon word, but there are many synonyms that can be used in its place. Some of these synonyms include: pre-existing, inherent, innate, inherent, or ingrained. All of these synonyms refer to something that is already present or exists within a person or object. Other synonyms for predispositional include foundational, underlying, inherent, or fundamental. These words can be used to describe traits or characteristics that are integral to a person or thing, such as a predisposition towards a certain type of behavior or a particular way of thinking. Overall, if you need to use an alternative word for predispositional, there are plenty of options available.