* Simple: Her trip to the beach was a moment of pure spontaneity.
* Descriptive: The artist's work was full of vibrant colors and spontaneous energy.
* Comparative: The team's success was due in part to their ability to adapt and embrace spontaneity.
* Figurative: The storm arrived with a sudden spontaneity, catching everyone off guard.
* Negative: His lack of spontaneity made him seem boring and predictable.
You can also use synonyms for "spontaneity" like "impulsiveness," "unplannedness," or "suddenness" depending on the specific context.