* Swiftly is an adverb, meaning "with speed."
* More swiftly is the comparative form, indicating a greater degree of speed.
* Most swiftly is the superlative form, indicating the highest degree of speed.
Example Sentences:
* Swiftly: The bird flew swiftly across the sky.
* More swiftly: The cheetah ran more swiftly than the lion.
* Most swiftly: Of all the runners, she ran most swiftly.