incontestable

/ˌɪnkənˈtɛstəbəl/

Other forms: incontestably

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. adjective

   not open to question; obviously true
   synonyms: indisputable, undisputable

   undeniable

   not possible to deny
2. adjective

   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