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Someone or something that is authoritative gives an impression of power and importance and is likely to be obeyed.

He has a commanding presence and a deep, authoritative voice.

Her smile was warm but authoritative.

Synonyms: commanding, lordly, masterly, imposing More Synonyms of authoritative.

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able to be trusted as being accurate or true; reliable.

able to be trusted as being accurate or true; reliable."clear, authoritative information and advice"

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