“潦草写成的东西”可以翻译为“scrawled writing” 或 “a scrawled piece (of writing)” 。“scrawl”有“潦草地书写；乱涂”之意，能很好地传达出书写潦草这一状态。
例如：This scrawled writing is really hard to read.（这份潦草写成的东西实在太难读了。）