1. the quality or state of being inexcusable; the fact of deserving no excuse or pardon
Usage: abstract noun formed from the adjective 'inexcusable'

Examples

• The inexcusableness of his behavior shocked everyone in the room.
• She recognized the inexcusableness of her mistake and apologized sincerely.
• The inexcusableness of lying to a friend cannot be overstated.
• He struggled to defend the inexcusableness of his actions.
• The inexcusableness of the crime warranted the harshest penalty.