unchallenged
unc·hal·len·ged
adjective
1.
- “undoubted evidence”
Origin
From un- + challenged.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.