1. too bad to be forgiven or justified; unacceptable

Examples

• His behavior at the meeting was inexcusable.
• It’s inexcusable to be late for your own wedding.
• The company’s treatment of its workers was inexcusable.
• She found his rudeness to the waiter inexcusable.
• The delay in emergency response was inexcusable.
• Such careless mistakes are inexcusable at this level.