Sillynice Share definition Flag The correct spelling of silliness. Can only be used when an exorbitant amount of stupidity is taking place. Hayden was being stupid and so Jason told him to “stop that Sillynice.” Sillynice by King_josiah92 December 24, 2018 0 0 Get merch Get the Sillynice mug. Buy Now — $32.95 See more merch