Not only is Lord Trimingham a noble and refined representative of Edwardian aristocracy, but also he is kind towards Leo.

refined 是动词 refine 的过去分词形式，refine 本意是"提炼、精炼"，引申为"使优雅、使有教养"。在这里 refined 用作形容词，表示"优雅的、有教养的"，形容特里明厄姆勋爵具有贵族阶层特有的优雅气质和良好教养。