IPA: /ˈstjuːpɪdɪst/
KK: /ˈstupɪdɪst/
The most lacking in intelligence or common sense; the highest degree of foolishness.
He made the stupidest mistake by not studying for the exam.
Comparative: stupider
Superlative: stupidest
Stupidest → It is formed from "stupid" (from Latin *stupidus*, meaning stunned or foolish) and the superlative suffix "-est" (meaning most). The word "stupidest" means the most foolish or lacking in intelligence.
Think of the Latin word for stunned or foolish, which helps you remember that "stupidest" refers to the most foolish.
No commonly confused words.