unmounted

adjective

1. seated or riding on a horse or other animal.
2. serving on horseback or on some special mount, as soldiers or police.
3. Military. (formerly) permanently equipped with horses or vehicles for transport.Compare mobile(def 4).
4. having or set in a mounting: mounted gems.
5. put into position for use, as guns.

adjective

1. equipped with or riding horsesmounted police
2. provided with a support, backing, etc

adj.1580s, “on horseback,” past participle adjective from mount (v.). From 1854 as “set up for display.”