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

The covid-19 pandemic would be a wake-up call for America, advocates for the elderly predicted: incontrovertible proof that the nation wasn’t doing enough to care for vulnerable older adults.

From Salon • Feb. 12, 2024

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

From "Long Walk to Freedom" by Nelson Mandela