Gloomy Gus is a term that is used to describe someone who is perpetually pessimistic or who always seems to have a negative outlook on life. If you are looking for alternative words to describe such a person, a few synonyms to consider include "downbeat," "morose," "dour," "sourpuss," "miserable," "low-spirited," "melancholy," "depressed," and "sullen." Each of these words conveys a sense of sadness, disappointment, or disillusionment, and they can be used to describe a range of emotional states and attitudes. Whether you are talking about a friend, a family member, or a co-worker who seems to be in a perpetual state of sadness or despair, these synonyms can help you find the right words to express your feelings and observations.