Unexcusable a. : Inexcusable.

Example:
How do you apologize to a good friend who helped you get a job and you end up getting terminated from the job?

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Defination from the web:
Unexcusable in the Online Dictionary. Meaning of Unexcusable. Pronunciation of Unexcusable. Translations of Unexcusable. ... Unexcusable. unexcused. unexcused delay. Unexcused Tardy. unexempt from. unexercised. unexhausted. Unexhaustible. Unexpand. unexpansive. Unexpect ...