Emotional pain on account of something done or experienced in the past, with a wish that it had been different; a looking back with dissatisfaction or with longing.
Dislike; aversion.
To feel sorry about (a thing that has or has not happened), afterthink: to wish that a thing had not happened, that something else had happened instead.
He regretted his words.
(more generally) To feel sorry about (any thing).
I regret that I have to do this, but I don't have a choice.
To miss; to feel the loss or absence of.