unpardonably

/ʌnˈpɑːrdənəbli/
adverb
  1. In a way that is too bad to be forgiven or excused.
    • He was unpardonably rude to his grandmother.
    • The company acted unpardonably by ignoring safety warnings.
    • She spoke unpardonably harshly to the new student.
Antonyms
What does "unpardonably" mean? | whatsthatwordmean | whatsthatwordmean