This is the 9660th most frequent Japanese word.
自発
"Self-motivation" or "spontaneous action."
In this sentence, 自発的 (jihatsuteki) is used as an adjective to describe actions that are initiated independently and voluntarily by the person.
彼の自発的な行動は皆に感銘を与えた。
His spontaneous actions impressed everyone.
Here, 自発的 (jihatsuteki) again functions as an adjective, emphasizing the quality of engaging in activities like learning willingly and without external prompting.
いつも自発的に学ぶことが大切です。
It's important to always learn voluntarily.
自発 (jihatsu) is used as a noun to convey the concept of taking initiative or acting independently.