The signature on the delivery receipt was illegible, so we contacted the courier to confirm.

送貨簽收單上的簽名難以辨認，所以我們聯絡快遞確認。

Please type your expense report, since handwritten forms are often illegible to the finance team.

請用打字填寫費用報告，因為手寫表格常常讓財務部看不懂。

The customer's address on the shipping label was smudged and completely illegible.

客戶在貨運標籤上的地址被弄糊了，完全無法辨認。