Inexcusable
/ˌɪnɪˈkskjuzəbəl/
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Definition
(adj) not excusable
Sentence Examples
When anyone tries to explain the inexplicable, he is getting ready to excuse the inexcusable.
Tom's behaviour at the party was inexcusable.
CEFR Practice Quiz
His lack of respect for his teachers was considered ____ by the school's head principal.