Superlatives are used to compare three or more things, and "lightly" is already an adverb describing the degree of something.
Here's why there's no direct superlative:
* Meaning: "Lightly" means "in a light or gentle manner." It's not a quantity or degree that can be compared like "big" or "fast."
* Grammar: Superlatives are usually formed by adding "-est" or "-est" to an adjective (e.g., lightest, fastest) or by using "most" before an adjective (e.g., most light, most fast). "Lightly" is already an adverb, not an adjective.
To express a stronger degree of lightness, you would use phrases like:
* Very lightly
* Extremely lightly
* Most delicately
* With the utmost lightness
These phrases convey a stronger sense of lightness without relying on a traditional superlative form.