Another word for regret
concern, compunction, worry, repentance, self-reproach, self-condemnation, self-disgust, misgiving, regretfulness, nostalgia, self-accusation, contrition, qualm, scruple, penitence, bitterness, disappointment, dissatisfaction, uneasiness, conscience, discomfort, annoyance, spiritual disturbance; see also care 2, repentance.
To be sorry for
mourn, bewail, lament, cry over, rue, grieve, repent, repine, have compunctions about, feel remorse for, look back upon, feel conscience-stricken, bemoan, moan, have a bad conscience, have qualms about, weep over, be disturbed over, feel uneasy about, rue the day, laugh out of the other side of one's mouth*, kick oneself*, bite one's tongue*, cry over spilt milk*.
To disapprove of