in•ex•cus•a•ble /ˌɪnɪkˈskyuzəbəl/ adj. that may not be excused:inexcusable behavior.

Is inexcusable or Unexcusable?

As adjectives the difference between inexcusable and unexcusable. is that inexcusable is not excusable while unexcusable is inexcusable.

Is Inexcused a word?

incapable of being excused or justified.