indefensible
adj. C1 Advanced US //ˌɪndɪˈfɛnsəbəɫ// UK //ˌɪndɪfˈɛnsəbəl// in·de·fen·si·ble
adj. so bad or unfair that it is impossible to justify or defend. You use this to describe a situation or a person's behavior that is clearly wrong.
adj. impossible to justify or defend; so bad that it is not worth arguing for. Often used to describe moral, legal, or logical positions that are clearly flawed.
The company's decision to fire the employee was indefensible.
The lawyer argued that the evidence was so weak that the defendant's conviction was indefensible.
The committee's refusal to address the growing safety concerns was seen as an indefensible oversight that could lead to serious legal consequences.
From in- + defensible.