There isn't a single, universally accepted term for a compound that cannot be solvated. However, depending on the context, you could use one of the following:

1. Insoluble: This is the most general term and simply means that the compound does not dissolve in a particular solvent.

2. Non-polar: This refers to compounds that lack a significant charge separation and therefore do not interact strongly with polar solvents like water.

3. Hydrophobic: This specifically describes compounds that repel water and do not dissolve in it.

4. Immiscible: This term is usually used for liquids that do not mix with each other, but can also be applied to solids that do not dissolve in a liquid.

5. Inert: This term is used if the compound does not react with the solvent and remains unchanged. However, it's not always accurate as a compound might be inert but still dissolve.

6. Crystalline: Some compounds are naturally crystalline and their structure prevents solvation.

It's important to note that "solvation" is a process that involves both dissolving and interacting with the solvent molecules. So, a compound can be insoluble but still interact with the solvent to a certain extent.

The most appropriate term to use will depend on the specific situation and the nature of the compound and the solvent.