It throws a shadow of insincerity over their most deeply felt emotions. 一般而言,只要是能有被动语态的及物动词,其过去分词都可以作定语。这不是个例,你不能说之前没见到 felt 就否定它。例如: their emotions are most deeply felt (被动语态) their most deeply fet emotions(作定语) the rivers are polluted. (被动语态) the polluted rivers(作定语)