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From Middle English auctoritatively, auctoritativeli; compare Medieval Latin auctoritātīve; equivalent to authoritative +‎ -ly.

• (UK) IPA^(key): /ɔːˈθɒɹɪtətɪvli/
• (US) IPA^(key): /ɔˈθɔɹəˌteɪtɪvli/

• Audio (Southern England):

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authoritatively (comparative more authoritatively, superlative most authoritatively)

1. In an authoritative manner; with authority.
   • 1888, Rudyard Kipling, “The Phantom Rickshaw”, in The Phantom 'Rickshaw and Other Tales, Allahabad: A.H. Wheeler and Co., page 8:

     He has, of course, the right to speak authoritatively, and he laughs at my theory that there was a crack in Pansay's head and a little bit of the Dark World came through and pressed him to death.

   • 2017 May 16, Dylan Byers, “Does anyone in Trump's White House have credibility?”, in CNN Business‎^[1], archived from the original on 22 March 2025:

     The inability of Trump's own spokespeople to speak authoritatively on the president's thinking and actions -- a challenge even Trump himself has acknowledged -- has left the White House with an enormous credibility gap, and has tarnished the reputations of many of its most visible spokespeople.