IPA: /ˈfɪərsnəs/
KK: /ˈfɪrsnəs/
The quality or state of being very intense, strong, or aggressive.
The fierceness of the storm surprised everyone in the town.
Fierceness → It is formed from "fierce" (from Old French *fier*, meaning proud or fierce) and the suffix "-ness" (meaning the state or quality of). The word "fierceness" refers to the state of being fierce or intense.
Think of the word 'fierce' which means intense or aggressive, and remember that 'fierceness' describes the quality of being fierce.