-
demonstrable, incontrovertible
necessarily or demonstrably true
-
demonstrated
having been demonstrated or verified beyond doubt
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inarguable, unarguable
against which no argument can be made
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bulletproof, unassailable, unshakable, watertight
without flaws or loopholes
-
unanswerable
impossible to answer
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unquestionable
incapable of being questioned
