unchallenged vs unquestioned

unchallenged and unquestioned both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unchallenged	No	Yes	No	No
unquestioned	No	Yes	No	No

As adjectives, unchallenged and unquestioned are synonyms defined as:

unchallenged and unquestioned: generally agreed upon; not subject to dispute

Other synonyms of unchallenged include undisputed.

unchallenged (adjective)	unquestioned (adjective)
generally agreed upon; not subject to dispute	generally agreed upon; not subject to dispute