努力地 is an adverb meaning 'hard' or 'diligently', describing how an action is performed. It is formed by the verb 努力 (nǔ lì, 'to strive' or 'to work hard') plus the adverbial particle 地 (de), which turns the preceding word into a modifier of a verb. Unlike the adjective form 努力 (e.g., 他很努力), 努力地 must directly precede a verb to describe manner — for example, 努力地学习 (study diligently). It emphasizes sustained effort and intentionality, commonly used in academic, professional, or personal growth contexts.

This adverb carries a positive, earnest connotation and is appropriate in both spoken and written Chinese. It’s often paired with verbs like 学习 (study), 工作 (work), 练习 (practice), or 尝试 (try). While 努力 alone can function as an adjective or verb, adding 地 makes it strictly adverbial — omitting 地 before a verb (e.g., *努力学习) is grammatically acceptable and more common in everyday speech, but 努力地 is preferred in formal writing or when emphasis on manner is needed.