Exact(1)
Richard Friedman argues: "[I]f there is no way of telling whether an utterance is authoritative, except by evaluating its contents to see whether it deserves to be accepted in its own right, then the distinction between an authoritative utterance and advice or rational persuasion will have collapsed" (Friedman 1973, 132).
Similar(7)
There is an ambiguity here: is an authoritative person one who is speaking the truth with respect to the particular utterance in question, or one who is generally truthful?
An utterance".
Authoritative! Hidebound!
He was authoritative.
Authoritative and impressive.
Mannered utterance often turns impenetrable.
The words themselves are authoritative.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com