sullen /sulˈən/

1. Gloomily angry and silent
2. Malignant, baleful
3. Dull, dismal

Sullenly

• silly-billies
• silly-billy
• silly-how
• silly-hows
• silly money
• silly season
• silly seasons
• Silly String®
• silo
• silo'd
• siloed
• siloing
• silos
• siloxane
• siloxanes
• silphia
• silphium
• silphiums
• silt
• siltation
• siltations
• silted
• siltier
• siltiest
• silting