regret

v. (-tt-) 1 feel or express sorrow, repentance, or distress over (an action or loss etc.). 2 acknowledge with sorrow or remorse (regret to say). n. Feeling of sorrow, repentance, etc., over an action or loss etc.  give (or send) one's regrets formally decline an invitation. [french regretter]

v. Pain of mind 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; grief; sorrow; especially, a mourning on account of the loss of some joy, advantage, or satisfaction.