Gelatinousness is a word that describes a texture or quality of something that is soft, thick, and somewhat fluid or jelly-like. There are several synonyms that can be used to describe this characteristic, including viscosity, stickiness, sliminess, rubberiness, and syrupiness. These words all imply a similar texture or consistency, but may be used differently depending on the context. For example, viscosity is often used in relation to liquids, while rubberiness may be used to describe a more solid material. Ultimately, the choice of synonym will depend on the specific object or substance being described and the effect that the writer wants to achieve.