Other forms: stagier; stagiest
Something that's stagy is so overly dramatic that it might as well have happened on a stage. When you talk to your friend in a loud, stagy voice, you behave as if you have an audience.
Something that's artificial and a bit theatrical is stagy, like the stagy decor in your bedroom or the stagy dialogue in a writer's first novel. You could also call these things hammy or exaggerated—they're just a little bit over the top. The adjective stagy comes from stage and its meaning of "a raised platform for a performance," from the Latin staticum, "place for standing."