Sentence:  We open in a grimy, fluorescent-lit military base somewhere in rural England, where the girl from the poster, Melanie (Sennia Nanua), is the star student in a class full of children who are wheeled into school—or at least, the <WSD>nondescript</WSD> concrete room that serves as a school—with their arms, legs, and foreheads bound to their wheelchairs by leather straps. 
Meaning of the word marked with <WSD> tags:  Without distinguishing qualities or characteristics; unexceptional.