His materialist beliefs lead him to measure success solely by financial gain.

materialist 是由名词 material（物质）加上后缀 -ist（表示"信奉某种主义的人"）构成的名词，指"物质主义者"或"唯物主义者"。materialist beliefs 指"物质主义的信念"，即认为物质财富是衡量一切的标准。