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