When thinking of synonyms for the phrase "most dullwitted," several words come to mind. These include unintelligent, foolish, naive, mindless, and simple. Other options to consider are dense, obtuse, slow-witted, and vacant. These words all suggest a lack of intelligence or understanding, and can be used to describe someone who has difficulty grasping simple concepts or making logical connections. In some cases, these terms can also imply a lack of common sense or awareness. When choosing a synonym for "most dullwitted," it's important to consider the context of the situation, as some words may be more appropriate than others.