If becoming just a bit more silly, "sillier"; if by far the most silly, "silliest".
Sillier would be comparing two objects, silliest, multiple things.
The superlative for silly is silliest.
The superlative of ignorant is "most ignorant."
The comparative is "stricter" and the superlative is "strictest".
Comparative: shallower Superlative: shallowest
The superlative of "sad" is "saddest" and the comparative is "sadder".
The superlative form of "generous" is "most generous."
Superlative the silly
sillier, the silliest
sillier, silliest
The word sociable is too long (at 3 syllables) to form into comparative or superlative forms by adding a suffix, instead, you would say more sociable or most sociable. Otherwise, it will just sound silly. If you just had the 2 syllable end of the word, able, that can be formed into comparative and superlative forms with suffixes; abler, ablest.
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.
"Studying" is not a superlative, as it is not an adjective. "Most studious" is a superlative of "studious."
"Bib" is a noun and, as such, does not have a superlative form.
most superlative is the superlative form of superlative
Tallest is the superlative.
superlative of quiet
bigger is the comparativebiggest is the superlative