IPA: /ˈfaɪəriər/
KK: /ˈfɪrɪər/
More intense or passionate than something that is fiery; having a stronger or more extreme quality of heat or emotion.
The debate became fierier as the candidates argued their points more passionately.
Comparative: fierier
Superlative: fieriest
Fierier → It is formed from "fier" (from Old French *fiere*, meaning fierce or wild) and the comparative suffix "-er" (meaning more). The word "fierier" means more fierce or more intense in nature.
Think of someone being 'more fierce' — 'fier' means fierce, and '-er' indicates a comparison, so fierier describes something that is more intense.