The Chinese word 不适 (bùshì) is formed through a straightforward morphological process of compounding, combining the negating adverb 不 (bù), meaning "not", with the adjective 适 (shì), which carries meanings of "suitable", "comfortable", or "well-adapted". This creates a single, stable lexical unit that functions as an adjective or verb meaning "unwell", "uncomfortable", or "not feeling right", most commonly used to describe a state of physical or mental discomfort or mild illness. Its formation follows a common Chinese word-formation pattern where negation directly modifies a core descriptive character to express the opposite state.