authoritative

Speak with an authoritative tone, or no one will listen to you. Why would they, if you sound like you don't even believe in yourself? Authoritative means sure or definitive.

When writing a paper, it can be useful to quote from an authoritative source, such as the encyclopedia, but you must also do enough research that your are fluent in your subject and can speak with the authoritative voice only true immersion can produce.

DEFINITIONS OF: authoritative

1

adj of recognized authority or excellence

Synonyms:
classic, classical, definitive
standard
established or well-known or widely recognized as a model of authority or excellence

adj sanctioned by established authority

“an authoritative communique”
Synonyms:
authorised, authorized
official
having official authority or sanction

adj having authority or ascendancy or influence

“the captain's authoritative manner”
Synonyms:
important
influential
having or exercising influence or power
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