👉 Sillier is a slang term that refers to someone who is not as intelligent, knowledgeable, or skilled in their fields of expertise. It's often used to describe someone who lacks confidence or enthusiasm for something they're learning, and may seem less competent than others. For example: - "He was an idiot at college, but he's still a siller at work." - "I'm not as smart as I should be, so I'm always silling up my studies." In general