Bitterenders are people who hold onto grudges and refuse to let go of negative emotions. There are many different synonyms for this term, including grudge holders, resenters, and embittered individuals. Other terms that could be used to describe bitterenders include malcontents, sourpusses, and cynics. Some people may also refer to these individuals as pessimists, as they tend to have a negative outlook on life. Regardless of what term is used to describe them, bitterenders can be difficult to deal with, and often require a great deal of patience and understanding from those around them. Despite this, it is important to recognize that everyone deserves to be treated with kindness and respect.