incontrovertible

American  

[in-kon-truh-vur-tuh-buhl, in-kon-] / ˌɪn kɒn trəˈvɜr tə bəl, ɪnˌkɒn- /

adjective

1. not controvertible; not open to question or dispute; indisputable.

   absolute and incontrovertible truth.

   Synonyms:

   unquestionable, undeniable, incontestable

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incontrovertible British  

/ ɪnˌkɒn-, ˌɪnkɒntrəˈvɜːtəbəl /

adjective

1. incapable of being contradicted or disputed; undeniable

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Other Word Forms

• incontrovertibility
  noun
• incontrovertibleness
  noun
• incontrovertibly
  adverb

Etymology

Origin of incontrovertible

First recorded in 1640–50; in- ³ + controvertible ( def. )

Explanation

When something is incontrovertible, it is undeniably, absolutely, 100 percent, completely true. That rain is wet is an incontrovertible fact. If you look at incontrovertible, you see that -controver-, as in controversy, is hiding inside. Add in the prefix, and it's easy to see that incontrovertible means there is no controversy about something, or, in other words, it is unchangeable and true. Incontrovertible evidence or proof is what you are looking for if you suspect that someone is doing something wrong.

Example Sentences

If the allegations are false, he needs to refute each and every detail in thorough, incontrovertible fashion.

From Los Angeles Times • Apr. 10, 2026

The incontrovertible truth is that however much fun you can have in politics and Farage is certainly doing that, power brings great responsibility.

From BBC • Feb. 4, 2026

Start with some incontrovertible rules to live by.

From MarketWatch • Jan. 9, 2026

His presence was proof of an incontrovertible fact about the festival, now in its second week: Cannes loves dogs.

From New York Times • May 21, 2024

They all talked at once, their voices insistent and contradictory and impatient, making of unreality a possibility, then a probability, then an incontrovertible fact, as people will when their desires become words.

From "The Sound and the Fury" by William Faulkner