IPA: /ˈdʌmbɪst/
KK: /dʌmbɪst/
The word describes someone or something that is considered to have the least intelligence or is the most foolish among a group.
He made the dumbest mistake in the exam by not reading the questions carefully.
Comparative: dumber
Superlative: dumbest
Dumbest → It is formed from "dumb" (from Old English "dumb", meaning unable to speak or silent) and the superlative suffix "-est" (meaning most). The word "dumbest" refers to the state of being the most unable to speak or express oneself, often used to describe a lack of intelligence in a figurative sense.
Think of someone who is 'unable to speak' ('dumb') and the '-est' indicating the highest degree — that's why 'dumbest' means the most unable to express oneself.