An ad verecundiam is an appeal to authority, argument from authority or authoritative argument.
authoritative
They are more likely to accept ads that includes an authoritative appeal. Eg: Celebrities and experts
The root word of authoritative is "authority."
"Only a court can give an authoritative interpretation of the law." "The government is awaiting an authoritative report on the disaster."
Non-authoritative means information is provided without official endorsement or validation, and may not be completely accurate or reliable. Authoritative means information comes from a trusted, official source and can be relied upon as accurate and trustworthy.
authoritative statements
The noun form of the adjective 'authoritative' is authoritativeness.A related noun form is authority.
The noun form of the adjective 'authoritative' is authoritativeness.A related noun form is authority.
The university professor's book on ancient civilizations is considered authoritative in the field.
aristocratic, authoritative
The Tanakh (Hebrew Bible) and the Talmud are the most authoritative. Pretty much everything else is derived from these two.