慎思 (shèn sī) is a classical Chinese compound meaning 'to think carefully' or 'to deliberate with caution.' The first character 慎 means 'cautious,' 'prudent,' or 'mindful,' while the second character 思 means 'to think' or 'to reflect.' Together, they emphasize thoughtful, measured consideration—especially before making decisions or judgments. This term carries a formal, scholarly, or moral tone, often appearing in philosophical texts, educational contexts, or advice about responsible conduct.

It’s commonly used in set phrases like 慎思明辨 (shèn sī míng biàn, 'think carefully and distinguish clearly') and frequently appears in Confucian writings emphasizing self-cultivation. While it can function as a verb in modern usage (e.g., 请慎思), it’s more often found in written or elevated speech than in casual conversation. Learners should note that it conveys seriousness and intentionality—not just ordinary thinking, but reflective, ethical deliberation.