undoubtedly

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

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

• Audio (US):

  (file)

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.

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