[{"Bold_text": "adjective", "List Items": ["having due authority ;having the sanction or weight of authority :an authoritative opinion.Synonyms: official", "substantiated or supported by documentary evidence and accepted by most authorities a field:an authoritative edition of Shakespeare; an authoritative treatment of a subject.", "having an air of authority ;accustomed to exercising authority ;positive; peremptory; dictatorial:said with an authoritative air.Synonyms: authoritarian , dogmatic"]}]