authoritative
Translation
authoritative, reliable, commanding
Examples
The book is an authoritative guide to the subject.
The book is an authoritative guide to the subject.
He has an authoritative manner.
He has an authoritative manner.
Grammar Patterns
((an authoritative)) ((noun)) an authoritative (noun) The book is an authoritative guide.
Similar Words
Synonyms: reliable, definitive, commanding; Antonyms: unreliable, unofficial
Etymology
From 'author', the creator or originator of something. If something comes from the 'author', it is considered original and reliable, hence 'authoritative'.
Memory Tips
Think of an 'author' whose work is the final word on a subject. Their writing is 'authoritative'.