Duncish, meaning stupid or dull, can have several antonyms depending on the context. Some possible antonyms include intelligent, bright, astute, alert, and quick-witted. These words all imply the opposite of the traits associated with duncishness, such as a lack of intelligence or awareness. Other antonyms could include knowledgeable, perceptive, clever, sharp, and keen. Duncishness may also be contrasted with acumen, sagacity, or shrewdness. By using antonyms, we can better understand the nuances of language and pinpoint the specific qualities that are present in different words.