The word 不妥 is formed through a straightforward morphological process in Chinese, combining the negation prefix 不 (bù), meaning "not", with the adjective 妥 (tuǒ), which conveys meanings such as "proper", "appropriate", or "settled". This creates a compound adjective where the prefix directly modifies and negates the root meaning, resulting in the overall sense of "improper", "inappropriate", or "not settled". It is a standard and productive pattern in Chinese word formation, similar to how "un-" is used in English, to generate a new word with a directly opposite meaning to its positive root.