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