The word "bummest" is an informal term that means "the least desirable" or "the worst". There are several synonyms that can be used in place of this word, such as "poorest", "lousiest", "shabbiest", "crappiest", "worst-off", "neediest", and "most disadvantaged". These words are often used to describe a situation, condition, or individual who is experiencing difficulties or hardships. It is important to remember that the use of words can have a significant impact on how we perceive and treat others. Therefore, it is crucial to choose appropriate language and be mindful of the possible effects of our words.