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

What does inexcusable stand for?

: impossible to excuse or justify inexcusable rudeness. Other Words from inexcusable Synonyms & Antonyms More Example Sentences Learn More About inexcusable.

What is inexcusable behavior?

inexcusable behaviour is so bad or rude that you cannot forgive the person who behaved like that. Her comments were highly offensive and quite inexcusable. an inexcusable mistake.