sullen /sulˈən/

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

Sullenly

• sheepdogs
• sheep-faced
• sheep-farmer
• sheep-farmers
• sheepfold
• sheepfolds
• sheep-hook
• sheep-hooks
• sheepier
• sheepiest
• sheepish
• sheepishly
• sheepishness
• sheepishnesses
• sheep ked
• sheep keds
• sheep-lice
• sheeplike
• sheep-louse
• sheep-master
• sheep-masters
• sheep meat
• sheep meats
• sheepo
• sheepos