纯粹 (chún cuì) is an adjective meaning 'pure,' 'sheer,' or 'outright,' emphasizing something that is unmixed, unadulterated, or entirely of one kind. The character 纯 means 'pure' or 'unmixed,' often used for substances, intentions, or qualities; 粹 means 'refined essence' or 'quintessence,' suggesting the highest, most concentrated form. Together, they intensify the idea of absolute authenticity or singularity — not just physically pure (like water), but also morally, emotionally, or motivationally undiluted (e.g., a purely altruistic act).

This word frequently modifies nouns (e.g., 纯粹的动机 'a purely motivated reason') or functions predicatively (e.g., 这完全是纯粹的误会 'This is a sheer misunderstanding'). It carries a slightly formal or literary tone and is common in written Chinese and thoughtful speech — especially when evaluating sincerity, intent, or authenticity. While it can describe physical purity, its most frequent modern usage relates to abstract qualities like motives, emotions, or categories.