incontestable

Something incontestable can't be argued with — it's absolutely true or right. It's an incontestable fact that the earth rotates around the sun.

You can't dispute something that's truly incontestable, because it's absolutely clear and unmistakably true. The witness to a car accident could say that it's the incontestable fault of the driver who ran a red light. And once you've signed all the necessary forms and been handed the keys, you're the incontestable owner of your new car. Incontestable adds the "not" prefix, in-, to contestable, "opposable," or "arguable."

Definitions of incontestable
1

adj not open to question; obviously true

Synonyms:
indisputable, undisputable
undeniable
not possible to deny

adj incapable of being contested or disputed

Synonyms:
incontestible
demonstrable, incontrovertible
necessarily or demonstrably true
demonstrated
having been demonstrated or verified beyond doubt
inarguable, unarguable
against which no argument can be made
bulletproof, unassailable, unshakable, watertight
without flaws or loopholes
unanswerable
impossible to answer
unquestionable
incapable of being questioned
Antonyms:
contestable
capable of being contested
challengeable
capable of being challenged
debatable, disputable
capable of being disproved
shakable, shakeable
capable of being weakened
questionable
subject to question
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