欣悦 (xīn yuè) is a literary and somewhat formal adjective meaning 'pleased' or 'delighted', conveying a warm, heartfelt sense of joy — often quieter and more refined than the stronger 欢喜 (huān xǐ) or the casual 高兴 (gāo xìng). The character 欣 means 'to be pleased; joyful', while 悦 means 'to be pleased; delighted'; together, they form a compound that emphasizes inner satisfaction and serene happiness, frequently used in written Chinese, formal speeches, or poetic contexts.

This word rarely appears in casual spoken conversation and is more common in essays, news reports describing positive developments, or expressions of gratitude. It often modifies nouns (e.g., 欣悦之情 'feeling of delight') or functions as a predicate (e.g., 他面露欣悦 'He showed delight on his face'). Because both characters carry similar meanings, the compound is a classic example of synonymic reduplication for emphasis and elegance.