Authoritative is defined as someone who knows a great deal about a certain subject and who is generally considered an expert.
Characterized by technical or polysyllabic vocabulary, complex sentence structure, and explicit transitions; not colloquial or informal:
Holding office or serving in a public capacity:
Find another word for ex-cathedra. In this page you can discover 4 synonyms, antonyms, idiomatic expressions, and related words for ex-cathedra, like: authoritative, formal, magisterial and official.