The word "ultrasmart" describes someone who is exceptionally intelligent and knowledgeable, but what are some antonyms for this term? Some possible antonyms could include "ignorant," "uninformed," or "unintelligent." Other terms that might apply include "dull," "stupid," or "ignoramus." Of course, the opposite of "ultrasmart" may depend on the context in which the word is being used. For example, someone who is ultrasmart in a particular field may be less knowledgeable in a different area. Ultimately, the antonyms for "ultrasmart" will vary depending on the context, but they may include terms that describe a lack of intelligence or knowledge.