Several customers complained that the new receptionist was incompetent and rude on the phone.

幾位客戶抱怨新來的櫃檯人員在電話中既無能又無禮。

The board replaced the incompetent manager after the project went far over budget.

專案嚴重超支後，董事會撤換了那位不稱職的經理。

We switched shipping companies because their incompetent staff kept losing our packages.

因為那家貨運公司不稱職的員工一直弄丟我們的包裹，我們就換了廠商。