adjective
acting or done without forethought; occurring or produced without human labor; happening or arising without apparent external cause; self-generated
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The artist's spontaneous brush strokes captured the essence of the scene perfectly.
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We had a spontaneous picnic in the park yesterday, it was so much fun!
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I love when we have those spontaneous hangouts, they're always a blast.
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His speech was so spontaneous, it felt like he was speaking straight from the heart.