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

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

Most egregiously, they seek to conceal an incontrovertible truth: roughly 38 million Americans currently live at the poverty line, 11 million of whom are children.

From Salon • Jan. 20, 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

I saw no advantage in calling witnesses to tty' to disprove something that was incontrovertible.

From "Long Walk to Freedom" by Nelson Mandela