authoritative
Translation
authoritative, reliable, official, commanding
Examples
This is the most authoritative book on the subject.
This is the most authoritative book on the subject.
She has an authoritative manner that people respect.
She has an authoritative manner that people respect.
Grammar Patterns
((authoritative)) + noun describing a source or a manner An authoritative book.
Similar Words
Synonyms: reliable, dependable (for information); commanding, assertive (for manner); Antonyms: unreliable, timid
Etymology
From 'authority' + '-ive' (having the quality of). It means having the quality of authority, so it is reliable or commanding.
Memory Tips
An 'authoritative' source has 'authority' and can be trusted. Note the difference from 'authoritarian', which is negative and about control.