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