Inexcusable

/ˌɪn.ɪkˈskjuː.zə.bəl/

Synonyms

  • irremediable
  • inacceptable
  • indefensible
  • unjustifiable
  • unpardonable

Slang Meanings

Totally unacceptable.
That kind of behavior? That’s just inexcusable!
No way to justify it.
His excuses were inexcusable; everyone saw what happened.