authoritative
牛津现代英汉双解词典
/ɔ:'θɒrətətɪv; [US] -teɪtɪv; ɔ`θɑrə,tetɪv/
adj
1 having authority; that can be trusted; reliable 有权力的; 有权威的; 可相信的; 可靠的
*information from an authoritative source 来自权威方面的消息.
2 given with authority; official 权威的; 官方的; 当局的
*authoritative instructions, orders, etc 官方的指示, 命令等.
3 showing or seeming to show authority 显示权力的; 好像显示权威的
*an authoritative tone of voice 权威式的口吻.
authoritative
朗文当代英英词典(第4版)
adj
an authoritative book, account etc is respected because the person who wrote it knows a lot about the subject
the most authoritative work on English surnames
behaving or speaking in a confident, determined way that makes people respect and obey you
He has a commanding presence and an authoritative voice.
>authoritatively adv