spontaneous in Chinese
自发 Traditional 自發
HSK 3.0 · Level 7–9 - spontaneous
Other words for spontaneous
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to take the initiative; to do sth of one's own accord; spontaneous; active; opposite: passive 被动; drive (of gears and shafts etc)
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arising involuntarily (idiom); spontaneous; to spring up unbidden (of emotion)
3 entries in ChineseDict list "spontaneous" as a meaning.