What's the plural form of incurvity? Here's the word you're looking for.
Answer
The noun incurvity can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be incurvity.
However, in more specific contexts, the plural form can also be incurvities e.g. in reference to various types of incurvities
or a collection of incurvities.