Being in midair is a feeling we experience in certain situations such as while jumping, flying or falling. To describe the opposite of being in midair, we can use several antonyms. For example, being grounded or firmly planted on the ground is the direct antonym for being in midair. Other antonyms may include being still, static or stationary. Being in midair can also be described as being weightless, so an antonym could be being weighed down. Overall, there are multiple options to describe the opposite of being in midair, depending on the context and situation.