The term 'Regretful Ones' can be summarized as 'ruers', a five-letter word. Ruers are people who feel regret or remorse for something they have done or failed to do. They may feel guilty, ashamed, or embarrassed about their actions or inactions. They may also feel sorrow or sadness for the consequences of their choices. Ruers often reflect on their mistakes and strive to make better decisions in the future.