authoritative
Pronunciation:
/ɔːˈθɒɹɪtətɪv//ɔˈθɑɹɪtətɪv/adjective
Definitions
Arising or originating from a figure of authority
Example: The authoritative rules in this school come not from the headmaster but from the aged matron.
Highly accurate or definitive; treated or worthy of treatment as a scholarly authority
Example: This book is the world's most authoritative guide to insect breeding habits.
Having a commanding style.
Example: He instructed us in that booming, authoritative voice of his.