rue

European strong-scented perennial herb with grey-green bitter-tasting leaves; an irritant similar to poison ivy.

Sadness associated with some wrong done or some disappointment.

“to his rue, the error cost him the game”

(French) a street or road in France.

Leaves sometimes used for flavoring fruit or claret cup but should be used with great caution: can cause irritation like poison ivy.

Feel remorse for; feel sorry for; be contrite about.