The phrase "lying dormant" can be used to describe a situation or object that is inactive or not currently being used. There are a variety of synonyms you can use to convey this same meaning, including "idle," "inactive," "dormant," "quiescent," "latent," and "resting." These words can be used interchangeably depending on the context, with each carrying a slightly different nuance. For example, "idle" implies a lack of activity or productivity, while "dormant" suggests a temporary state of inactivity that could potentially be awakened. Using these synonyms in place of "lying dormant" can add variety and depth to your writing.