When it comes to describing something that has a brief lifespan or limited duration, there are a variety of synonyms that can come in handy. Some alternatives to the word "short-term" include "temporary," "transient," "impermanent," "brief," "ephemeral," and "fleeting." These words all describe something that is not intended to last for an extended period of time, and can be a useful way to add variety to your writing. Whether you're referring to a temporary situation, a brief encounter, or a passing trend, using a synonym for "short-term" can help you convey your message more effectively.