Her signature was an illegible scrawl.

　　她的簽名潦草難辨。

　　The name on the gravestone was badly worn and almost illegible.

　　墓碑上的名字磨損得很嚴(yán)重，幾乎無法辨認。

　　Her handwriting is completely illegible.

　　她的字跡完全不能辨認。

　　It is impossible to deliver this letter because the address is illegible.

　　由于地址字跡不清，致使信件無法投遞。

　　The words have become illegible.

　　字跡漫漶。