authoritatively
adverb
[ ɔːˈθɒrətətɪvli ]
• in a way that is trusted as being accurate or true; with authority.
• "he could speak authoritatively on art, philosophy, literature, history, current affairs"
• in a commanding and self-confident manner that induces respect and obedience.
• "she shouted authoritatively, 'Hey you! Drop your weapon, now!'"
