She was the silliest girl in the school.
No; it's an adjective, which is used to describe (usually) someone. Although I can't find silliest but have heard people use it, try this: You are the silliest person I've ever met. Person is described by the adjective silliest. Definition of silly: weak-minded or lacking good sense; stupid or foolish
The silliest song is the OBAMA song.
Probably the silliest sentence I ever heard was in song lyrics that go, "We're off to see the Wizard--the Wonderful Wizard of Oz!"
it is the Chimp
NO!!!! Joe Jonas is the silliest one,although Kevin is super silly on their show JONAS !!!
I don't know what superlativest is, but the superlative of silly is silliest. Such as superlativest is the silliest word on this webpage. Just my opinion, it may not be.
sillier, the silliest
silliest. There are two "i's".
There are no stupid questions.
jimmithy Spongebob Squarepants
If becoming just a bit more silly, "sillier"; if by far the most silly, "silliest". Sillier would be comparing two objects, silliest, multiple things.