Rue'ful, a.
a. [From rue and full.]
Sense 1. Causing one to rue or lament; woful; mournful; sorrowful; fit to be lamented.
Spur them to rueful work. Shak.
Sense 2. Expressing sorrow. “Two rueful figures, with long black cloaks.” W. Scott.
He sighed, and cast a rueful eye. Dryden.