generally regarded as providing knowledge or information that can be trusted
having or showing authority; demanding or deserving respect and obedience
"an important official"
"the captain's authoritative manner"
"the definitive work on Greece"
"classical methods of navigation"
"an authoritative communique"
"the authorized biography"
He was diligent and in acting authoritative.
出自： R. North
Above the general chatter, a loud authoritative voice cried, 'Now, then, what's the trouble 'ere?'
出自： L. W. Meynell