Unchallenged (adjective)

1. Not called into question or doubted.
2. Not opposed or contested.

Origin:

Early 17th century: from un- (expressing negation) + challenged.

Examples:

1. His authority went unchallenged.
2. The hypothesis went unchallenged for many years.
3. The champion's title remained unchallenged.
4. The company's dominance in the market went unchallenged.
5. His statement went unchallenged, as no one had any proof to the contrary.