unjustifiable
If you describe an action, especially one that harms someone, as unjustifiable, you mean there is no good reason for it. adj
(Antonym: justifiable)
Using these missiles to down civilian aircraft is simply immoral and totally unjustifiable.
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unjustifiably adv
(Antonym: justifiably)
The press invade people's privacy unfairly and unjustifiably every day.