Definition

Something that cannot be disputed or questioned; it is accepted as true or valid without any argument.

Example

The scientist presented unchallengeable evidence to support her theory.

Conversation

Did you hear about the new study on climate change?

Yeah, they claim the results are unchallengeable at this point.

That’s impressive! It’s good to know some facts are solid.

Absolutely! It gives us a clearer picture of what we’re facing.

Synonyms & Antonyms

Root Explanation

Unchallengeable → It is formed from "un-" (meaning not), "challenge" (from Old French *chalenge*, meaning to accuse or dispute), and "-able" (meaning capable of). The word means not capable of being disputed or challenged.

Memory Tip

Think of 'not' ('un-') being able to 'dispute' ('challenge') something — that's why unchallengeable means something that cannot be disputed.

Visually Confused Words