Synonyms of 'authoritative'
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Accurate information, measurements, and statistics are correct to a very detailed level. An accurate instrument is able to give you information of this kind.
This is the most accurate description of the killer to date.
An approved method or course of action is officially accepted as appropriate in a particular situation.
The approved method of cleaning is industrial sand-blasting.
Someone who is assertive states their needs and opinions clearly, so that people take notice.
an assertive style of management
Thesaurus for authoritative from the Collins English Thesaurus
Someone or something that is authoritative gives an impression of power and importance and is likely to be obeyed .