undoubtedly

From Middle English undoutedly, equivalent to undoubted +‎ -ly.

• IPA^(key): /ʌnˈdaʊtɪdli/
• Hyphenation: un‧doubt‧ed‧ly

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undoubtedly (comparative more undoubtedly, superlative most undoubtedly)

1. Without doubt; definitely.
   • 1904–1905, Baroness Orczy [i.e., Emma Orczy], “The Ayrsham Mystery”, in The Case of Miss Elliott, London: T[homas] Fisher Unwin, published 1905, →OCLC; republished as popular edition, London: Greening & Co., 1909, OCLC 11192831, quoted in The Case of Miss Elliott (ebook no. 2000141h.html), Australia: Project Gutenberg of Australia, February 2020:

     The cane was undoubtedly of foreign make, for it had a solid silver ferrule at one end, which was not English hall–marked.

   • 1956 May, “Transport in Ulster”, in Railway Magazine, page 279:

     He declared that these drastic steps would undoubtedly inconvenience a good many people, but the alternative was bankruptcy of the Ulster Transport Authority and the breakdown of public transport services.

   • 2025 May 2, Amarachi Orie, “Archaeologists discover true identity of Costa Rica shipwrecks long thought to be pirate ships”, in CNN‎^[1]:

     “It’s been a long process and I’ve come close to giving up along the way, but this is undoubtedly the craziest archaeological excavation I’ve yet been part of,” Bloch said in the news release.

• indubitably
• unquestionably
• doubtlessly
• undoubtably
• without a doubt