醉心 (zuì xīn) is a verb meaning 'to be deeply obsessed with' or 'to devote oneself wholeheartedly to' something — often a hobby, art form, subject of study, or ideal. Literally, 醉 means 'intoxicated' or 'enraptured', and 心 means 'heart' or 'mind'; together, they evoke the image of being so captivated that one’s heart feels 'drunk' with passion or fascination. It carries a positive, earnest connotation — not mere infatuation, but sustained, focused dedication.

This word is commonly used in formal or literary contexts, especially when describing intellectual or artistic pursuits: someone devoted to calligraphy, classical music, environmental protection, or historical research. It implies depth, sincerity, and long-term commitment rather than fleeting interest. While it can occasionally appear in spoken Chinese, it's more frequent in writing, essays, or biographical descriptions — never used for trivial or negative obsessions (e.g., gambling or addiction), for which other terms like 着迷 or 上瘾 are preferred.