There is no word in the English language called "duddest." Hence, antonyms cannot be provided for this fictional term. However, we can look at antonyms for the word "dud" meaning a failure or something which doesn't work correctly. Some antonyms for this word include successful, achiever, hit, triumph, star, champ, and winner. So, if you ever come across the word "duddest" in the future, remember that it is not a real term in the English language, and if you are referring to a "dud," there are plenty of other words that describe the opposite.
