This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. superlative form of silly: most silly.

"Days before the repeal effort was announced, he came up with yet another way to apply the word silliest to the ban, saying: I think that was one of the silliest, silliest decisions anyone made, to outlaw foie gras."

chilliest