1. (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.

2. (v.) Dislike; aversion.

3. (v. t.) To experience regret on account of; to lose or miss with a sense of regret; to feel sorrow or dissatisfaction on account of (the happening or the loss of something); as, to regret an error; to regret lost opportunities or friends.

abject apology acknowledgment affliction anguish apologies apology attrition ayenbite of inwit be sorry for bemoan bewail bitterness breast-beating care compunction confession contriteness contrition demur deplore deprecate disappointment disapprove dole dolor excuse feel sorry for grief grieve guilt heartache heartbreak lament mea culpa mourn mournfulness pangs of conscience penitence qualm refusal regretfulness regrets regretting remorse remorse of conscience remorsefulness repent repentance repine repining rue rue the day ruefulness sadness scruple second thoughts self-condemnation self-reproach shame shamefacedness shamefastness shamefulness sorriness sorrow weep over wistfulness woe