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unpardonable, inexcusable, unforgivable, indefensible, unjustifiable, unremittable | not admitting of pardon | |
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indefensible, untenable | (of theories etc) incapable of being defended or justified | |
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unwarranted, indefensible, insupportable, unjustifiable, unwarrantable | incapable of being justified or explained | |
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indefensible | not able to be protected against attack |