The term 'Feel Bad About' can be summarized by three crossword solutions: RUE, REGRET, and LAMENT. RUE is a verb meaning to feel deep sorrow or REGRET for something that has happened. REGRET is a noun meaning a feeling of sadness or disappointment about something that has happened or been done. Lastly, LAMENT is a verb meaning to express grief or sorrow for something. All three words are used to describe the feeling of being sorry or sad about something that has happened.