呆板 (dāi bǎn) is an adjective describing someone or something that lacks flexibility, spontaneity, or creativity — rigid in behavior, thinking, or expression. The character 呆 means 'dull' or 'stupid', suggesting a lack of mental liveliness; 板 literally means 'board' or 'plank', evoking stiffness and inflexibility. Together, they form a vivid metaphor: like a wooden board, the person or thing is unyielding and lifeless.

This word is commonly used to criticize overly formal, mechanical, or unimaginative approaches — for example, in teaching methods, artistic performances, or interpersonal communication. It often carries a mildly negative connotation, implying dullness rather than mere seriousness. While it can describe people (e.g., a teacher), it’s equally common for describing systems, designs, or routines that feel monotonous and uninspired.