However, there are several ways to express a higher degree of unusualness:
* More unusual: This is the most straightforward way to express a comparative.
* Less common: This is a synonym that implies a higher degree of unusualness.
* Rarer: This is another synonym with a similar meaning.
* More peculiar: This emphasizes the strangeness or oddness of something.
* More out of the ordinary: This emphasizes that something is different from the norm.
The best choice will depend on the specific context and the desired nuance.