authoritative
adjective uk/ɔːˈθɒr.ɪ.tə.tɪv/ us/əˈθɔːr.ə.t̬ə.t̬ɪv/
专断的；命令式的；权威性的
showing that you are confident, in control, and expect to be respected and obeyed
She has an authoritative manner that at times is almost arrogant. 她爱发号施令，有时几乎到了盛气凌人的地步。
权威的；可信的；可靠的
containing complete and accurate information, and therefore respected
The book is an authoritative account of the Second World War. 这本书对第二次世界大战作了非常权威的记述。