1. having due authority; having the sanction or weight of authority: an authoritative opinion.
2. substantiated or supported by documentary evidence and accepted by most authorities in a field: an authoritative edition of Shakespeare; an authoritative treatment of a subject.
3. having an air of authority; accustomed to exercising authority; positive; peremptory; dictatorial: said with an authoritative air.
"words can be authoritative as words."
"winners can be authoritative in things."
"voices can be authoritative with words."
"sources can be authoritative."
"directives can be authoritative."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.