IPA: //ˈfɪərsɛst//
KK: /ˈfɪr.sɛst/
The most intense or aggressive in nature or behavior.
The fiercest competitor won the championship.
Comparative: fiercer
Superlative: fiercest
Fiercest → It is formed from "fierce" (from Old French *fier*, meaning proud or fierce) and the superlative suffix "-est" (meaning most). The word "fiercest" means the most fierce or intense in nature.
Think of the word 'fierce' meaning intense or aggressive, and remember that 'fiercest' means the most intense or aggressive.