There are multiple definitions - click on the translation that matches your context.

incontestado

adjetivo

full

unchallenged

adjective

Definitions of unchallenged

accepted as right or correct and so not questioned or argued about

This version of events remained unchallenged.

not opposed by anyone

The party is likely to win at least 154 unchallenged seats out of 300.

not stopped from going somewhere

The robbers gained unchallenged entry to the burglarproof subterranean vaults of the Banque de France.