The word "呆傻" is formed by combining two characters that each convey foolishness. "呆" is ideographically composed of "口" (mouth) above "木" (tree), suggesting a person whose speech or expression is as rigid as wood, indicating dullness. "傻" incorporates the radical "亻" (person) with components such as "囟" (fontanel), which historically implies an empty or simple mind, denoting silliness. Together, these characters semantically reinforce each other to mean stupidity or foolishness.