Rue

1. Sorrow; repentance; regret.
2. Pity; compassion.

1. To cause to repent of sin or regret some past action.
2. To cause to feel sorrow or pity.
3. To repent of or regret (some past action or event); to wish that a past action or event had not taken place.

   I rued the day I crossed paths with her.

4. To feel compassion or pity.
5. To feel sorrow or regret.

noun

Any of various perennial shrubs of the genus Ruta, especially the herb Ruta graveolens (common rue), formerly used in medicines.