Extensibleness is the ability to be expanded or stretched out, and there are different synonyms that describe this trait. One of them is expansiveness, which implies the state of being wide or vast, both in a physical or metaphorical sense. Another synonym is flexibility, which suggests adaptability and the capacity to change or adjust according to circumstances. Moreover, pliability is also a synonym for extensibleness, and it refers to the ability to be easily bent or shaped without breaking. Lastly, we can also use the term elasticity to describe a material or concept that can be stretched and then returns to its original form.