Inert is a word that is often used to describe something that lacks energy or movement. There are several synonyms for the word inert that can be used in place of this term. Some common synonyms include lifeless, motionless, immobile, stagnant, and static. Each of these synonyms carries a slightly different connotation, but they all describe something that is not actively moving or changing. Other synonyms for inert include sluggish, dormant, unresponsive, and passive. These words can also be used when describing objects or substances that do not have the ability to react or exhibit chemical changes. By using different synonyms, writers and speakers can enrich their communication by conveying subtle differences in meaning and tone.