IPA: /ʌnˈkwɛs.tʃənd/
KK: /ʌnˈkwɛsʧənd/
Something that is accepted without doubt or challenge; it is certain and not questioned.
Her authority in the field is unquestioned by her peers.
Unquestioned → It is formed from "un-" (meaning not) and "question" (from Latin "quaestio", meaning inquiry or investigation) and the suffix "-ed" (indicating a past participle). The word "unquestioned" means not subject to inquiry or doubt, implying certainty or acceptance without challenge.
Think of 'not' ('un-') allowing something to be accepted without 'inquiry' ('question') — that's why unchallenged beliefs are considered unquestioned.