IPA: /ˈblʌntɪst/
KK: /blʌntɪst/
The most dull or not sharp; lacking a fine edge or point.
The bluntest knife in the drawer couldn't cut through the paper.
Comparative: blunter
Superlative: bluntest
Bluntest is formed from "blunt" (from Old French *blunt*, meaning dull or not sharp) and the superlative suffix "-est" (meaning most). The word "bluntest" refers to the most dull or least sharp object or quality.
Think of something that is the "most dull" — the root "blunt" means not sharp, and adding "-est" indicates the highest degree of that quality.
No commonly confused words.