IPA: /ˈfɪəriˌli/
KK: /ˈfɪəriˌli/
In a passionate or intense way, often showing strong emotions like anger or enthusiasm.
She spoke fierily about the importance of protecting the environment.
Fierily → It is formed from "fier" (from Old French *fier*, meaning proud or fierce) and the adverbial suffix "-ly" (meaning in a manner of). The word "fierily" means in a fierce or intense manner.
Think of someone acting in a 'fierce' way ('fier') and remember that 'fierily' describes doing something in a fierce manner.