Mounted, in its most common usage, means to be positioned above or on top of something, such as a horse or a vehicle. The opposite of this word is "dismounted." Dismounted means to get off of something that one is mounted on, and it can be used in a variety of contexts. For instance, a cyclist may dismount their bike to walk it across a busy street. Similarly, a rider might dismount from their horse to take a break or to groom it. In general, the antonyms for dismounted might include various forms of mounting, depending on the specific situation.