The term BE REGRETFUL can be broken down into three crossword solutions: RUE (3 letters), REPENT (6 letters), and KICKONESELF (11 letters). RUE means to feel deep sorrow or regret, REPENT means to feel remorse for a wrong committed and to make amends, and KICKONESELF means to regret an action or decision. All three words are synonyms for the term BE REGRETFUL, which means to feel sorrow or regret for something done or not done.