The noun adversity can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be adversity. However, in more specific contexts, the plural form can also be adversities e.g. in reference to various types of adversities or a collection of adversities.

Is there such a word as adversities?

noun, plural ad·ver·si·ties for 2. adverse or unfavorable fortune or fate; a condition marked by misfortune, calamity, or distress: Friends will show their true colors in times of adversity. an adverse or unfortunate event or circumstance: You will meet many adversities in life.

How do you use adversities in a sentence?

They are studying the ' glue' of a couple - the bond that keeps them together despite adversities. His grounding has prepared him for many adversities, but he is also making his mistakes in an unforgiving environment. The idea that he should give his past adversities credit for his current success horrifies him.