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。