Short-lived is a term used to describe something that does not last for a long time. There are many synonyms for this word that can be used to describe fleeting moments or things that come to an end quickly. Some of the words that can be used in place of short-lived include brief, fleeting, momentary, transient, passing, temporary, ephemeral, and transitory. All of these words describe something that is not permanent, and they can be used to describe a variety of things, such as emotions, trends, or events. Whether you are trying to describe a short-lived relationship or a moment of happiness, there are many words that can be used to accurately convey the temporary nature of the subject.