A drinking straw with a fixed, amusing shape that includes loops.

plural of silly straw

aerosol string

An epithet used in mild teasing for a silly person, or one who has just done something of a foolish nature.

Alternative spelling of Silly Billy

(humorous) A hypothetical pill that makes those who take it silly.

plural of silly pill

(idiomatic, journalism) A period, usually during the summertime, when news media tend to place increased emphasis on reporting light-hearted, offbeat, or bizarre stories.

(now rare, dialectal) The caul which sometimes envelopes the top of a child's head after birth.

plural of silly goose