An example of sulky is the sad look on a dog's face after it's been scolded for getting into the trash.
A sulky day.
The sulky child.
Origin of sulky
- Perhaps alteration of obsolete sulke sluggish perhaps ultimately from Old English āsolcen from past participle of āseolcan to become sluggish N., from its having only one seat
From American Heritage Dictionary of the English Language, 5th Edition