IPA: /ʌnˈtʃælɪndʒd/
KK: /ʌnˈtʃælɪndʒd/
Not facing any competition or difficulties; not being tested or challenged.
The champion remained unchallenged throughout the tournament.
Unchallenged → It is formed from "un-" (meaning not) and "challenged" (from Old French *chalenge*, meaning to accuse or dispute). The word "unchallenged" means not being accused or disputed, indicating a state of being accepted without opposition.
Think of 'not' ('un-') being added to 'challenged' — this helps you remember that 'unchallenged' means something that is accepted without any dispute.