遗憾 (yí hàn) expresses a feeling of regret or disappointment—often about something that has already happened and cannot be changed. The character 遗 (yí) means 'to lose' or 'to leave behind', while 憾 (hàn) means 'to feel sorrowful or distressed'. Together, they convey the sense of 'a sorrowful loss' or 'a lingering sense of what was missed'. It’s commonly used in both spoken and written Chinese to describe personal feelings (e.g., missing an opportunity) or empathetic reactions (e.g., expressing sympathy for someone else’s misfortune).

This word carries a gentle, reflective tone—not as intense as 悲伤 (sadness) or 怨恨 (resentment), but more poignant than 失望 (disappointment). It often appears after verbs like 感到, 觉得, or 留下, and can function as either a noun ('a regret') or an adjective ('regrettable'). It’s frequently used in formal speech, letters, and media to express polite, restrained emotion.