When describing a situation where nothing significant is taking place, there are a variety of synonyms that can be used to add interest and variation. For example, the phrase "a lull in activity" could be used to indicate a temporary break in action. "Idle time" or "down time" also convey the idea of a lack of activity or productivity. If there is a sense of boredom or tedium associated with the situation, "dullness" or "tediousness" could be used. Other options include "inactivity," "stagnancy," or "standstill." Whatever the context, using synonyms for "with nothing happening" can help to make your writing more dynamic and engaging.