← BackshareGuesssillily/ˈsɪlɪli/adverbIn a way that shows a lack of good sense, judgment, or seriousness; foolishly.She danced sillily around the room, making everyone laugh.He grinned sillily at his own joke.They spent the afternoon sillily chasing each other with water balloons.SynonymsfoolishlyabsurdlyAntonymssensibly