spontaneous

Indicates a complete lack of planning.

Indicates a significant degree of being unplanned.

Emphasizes that something is truly unplanned and authentic.

Indicates that something appears unplanned on the surface.

Suggests that something seems unplanned, but this might not be the case.

To act in a natural, unplanned way.

To appear to be unplanned or natural, from an external perspective.

To give the impression of being unplanned or natural.