The word "dummiest" refers to the least intelligent, foolish, or unwise person or thing. Antonyms for this word could include terms like wise, intelligent, smart, astute, clever, or shrewd. Other options might include terms like knowledgeable, experienced, informed, or insightful. When trying to convey the opposite of "dummiest," it is important to consider the context in which the word is being used and to select an antonym that accurately conveys the intended meaning. By selecting the appropriate antonym for "dummiest," writers and speakers can help to ensure that their communication accurately reflects their intended message.