authoritative
UK /ɔːˈθɒɹɪtətɪv/ · US /əˈθɔɹɪˌteɪtɪv/ adjective
- adjective Arising or originating from a figure of authority. “The authoritative rules in this school come not from the headmaster but from the aged matron.”
- adjective Highly accurate or definitive; treated or worthy of treatment as a scholarly authority. “This book is the world's most authoritative guide to insect breeding habits.”
- adjective Having a commanding style. “He instructed us in that booming, authoritative voice of his.”
Synonyms
formal proper ex cathedra definitive of record precise grave magisterial masterful oracular sterling important classical classic authorized authorised
Webster’s 1913
- adjective Having, or proceeding from, due authority; entitled to obedience, credit, or acceptance; determinate; commanding.
- adjective Having an air of authority; positive; dictatorial; peremptory; as, an authoritative tone.
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “authoritative”, CC BY-SA 4.0. Details