authoritative
[adjective]
Synonyms:
- reliable, accurate, authentic, definitive, dependable, trustworthy, valid
- commanding, assertive, imperious, imposing, masterly, self-assured

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Contrasted words: contestable, controversial, debatable, disputable, refutable, dubious, questionable, suspect, unreliable
Related Words: attested, authenticated, circumstantiated, confirmed, proven, validated, verified, convincing, indisputable, irrefutable, sure, unrefutable, cathedral, cathedratic

[TahlilGaran] English Synonym Dictionary ▲

au‧thor‧i‧ta‧tive AC /ɔːˈθɒrətətɪv, ɔːˈθɒrɪtətɪv, ə- $ ɒːˈθɑːrəteɪtɪv, əˈθɔː-/ adjective
[Word Family: noun: authority, authorization, authoritarian, authoritarianism; adjective: authoritarian, authoritative, authorized ≠ unauthorized; verb: authorize; adverb: authoritatively]

1. 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

2. 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 adverb

[TahlilGaran] Dictionary of Contemporary English ▲