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

Start with some incontrovertible rules to live by.

From MarketWatch • Jan. 9, 2026

"I was not persuaded that even if a survey was carried out, that it would be conclusive one way or the other, that it would produce incontrovertible data."

From BBC • Nov. 25, 2025

And while actors aren’t required to be activists, evading a concrete statement while promoting a film about a woman who has devoted her post-boxing career to social advocacy gives “Christy” and Sweeney an incontrovertible dissonance.

From Salon • Nov. 8, 2025

For Nikki, who died Monday at 81, our future depends upon our willingness to learn from everyday Black folks’ refusal to accept status-quo cruelties as incontrovertible realities.

From Los Angeles Times • Dec. 15, 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