The signature on the delivery receipt was indecipherable, so we called the courier to confirm.

送貨簽收單上的簽名無法辨識，所以我們打電話向快遞員確認。

Several customers complained that the handwritten notes on their invoices were indecipherable.

好幾位客戶抱怨發票上的手寫備註根本看不懂。

After the file was corrupted, most of the quarterly budget spreadsheet became indecipherable.

檔案毀損後，季度預算試算表大部分內容都變得無法解讀。