inexcusable
🇺🇸
/ˌɪnɪkˈskjuːzəbl/
🇬🇧
/ˌɪnɪkˈskjuːzəbl/
so bad that it cannot be accepted or forgiven
Not apologizing for such a big mistake is inexcusable.
為這麼大的錯誤不道歉是不可原諒的。