Usage Note
Espontáneo describes actions or people that are natural and unplanned. As a noun, un espontáneo refers specifically to a spectator who jumps into a bullfighting ring without permission — a very Spanish cultural usage. The adverb espontáneamente is the standard derivative. The feminine form is espontánea.
Examples
"Su reacción fue completamente espontánea."
Natural Translation
His reaction was completely spontaneous.
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