Rr: Rue

v. rued, ru·ing, rues
v.tr.
To feel regret, remorse, or sorrow for.
v.intr.
To feel regret, remorse, or sorrow.
n.
Sorrow; regret: "To their rue, the Social Democrats have to acknowledge that the Conservative-Liberal coalition has captured the center where elections are won" Elizabeth Pond.
[Middle English ruen, from Old English hrowan, to affect with grief, and hrowian, to repent.]