The phrase "unquestionable authority" means a person or source of information that is completely trusted and believed without any doubt or hesitation. Full definition
For in truth, «No right is held more sacred, or is more carefully guarded, by the Common Law, than the right of every individual to the possession and control of his own «person,» free from all restraint or interference of others [including government], unless by clear and unquestionable authority of law. (law.stackexchange.com)
How can that develop from a relationship with one who has unquestionable authority over us, especially if we think that blessedness includes a significant degree of self - direction? (religion-online.org)
While maps often assume an unquestionable authority of accuracy and fact (until they are proven outdated), Rodriguez dismantles conventional notions of locale and geography through intuitive associations and personal narratives. (artpace.org)