Yes, it does.
to regret
rue means regret so it means regret the day. "You will rue the day you made fun of me!"
Regretted
The core word is 'rue', or to regret. So ruthless is without regret, and rueful or ruefully is with regret.
It means regret, or fat flower.
In the Hunger Games, the name rue mean a yellow flowers in the pond.
RUE
woe, rue
lamentable, rue
A six letter word that has the same meaning of 'rue' is regret.
Rue.
to regret something that has already been done