The phrase "all-filling" can be used to describe something that is highly satisfying, satiating, and nourishing. When searching for synonyms to describe this type of experience, one might consider words such as fulfilling, gratifying, satisfying, and nourishing. Other options might include filling, satiating, contented, and satisfyingly full. Additionally, one could use terms like replete, satiated, or well-fed to describe a feeling of fullness or satisfaction. Depending on the context in which the term is being used, there may be many suitable synonyms to describe the idea of something that is all-filling or satisfying in every way.