Scriptedest means it pretends to be unscripted and spontaneous but in fact it is totally fake and staged.
MTV's Moving In is the scriptedest reality show ever.
Dude on MTV: I am an ultimate fighter and I have arachnophobia.
MTV Viewer: No kidding.
Dude on MTV wakes up in the middle of the night, screams "there's a bug in my pants!", runs away in a direct line from the camera and jumps into a garden swimming pool.
MTV Viewer: Fuck, this is the scriptedest show ever!