The superlative of shiny is shiniest.
Shinner and shinniest
The superlative of "shine" is "shiniest."
The superlative for "light" is "lightest."
most current
The superlative degree of heavy is "heaviest."
Shiniest or most shiny.
Shinner and shinniest
shinier, shiniest
shinier shiniest
most brilliant
Sleep is a noun and does not have a superlative. Sleepy is an adjective and the superlative is "sleepiest."
The superlative for willing would be "most willing." There is no one-word superlative.
"Bib" is a noun and, as such, does not have a superlative form.
"Studying" is not a superlative, as it is not an adjective. "Most studious" is a superlative of "studious."
Tallest is the superlative.
superlative of quiet
most superlative is the superlative form of superlative