Flat
Flat adverb - To a full extent or degree.
Undoubtedly and flat are semantically related. In some cases you can use "Undoubtedly" instead an adverb "Flat".
Undoubtedly
Undoubtedly adverb - Without any question.
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Synonyms for Undoubtedly
Flat and undoubtedly are semantically related. Sometimes you can use "Flat" instead an adverb "Undoubtedly".
Nearby Word: undoubted
Mutual synonyms
Both words in one sentence
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Compare nearly flat-chested Ao and Rin, who are either beat down quite often or don't fight at all, with stacked up Hime and Kotoha, who can undoubtedly hold their own in a fight against stronger enemies.
Source: Manga / Yozakura Quartet - They soon had me patched up so that, except for weakness from loss of blood and a little soreness around the wound, I suffered no great distress from this thrust which, under earthly treatment, undoubtedly would have put me flat on my back for days.
Source: After-Action Healing Drama
Cite this Source
Undoubtedly and Flat. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/flat/undoubtedly
Flat & Undoubtedly. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/flat/undoubtedly>.
Undoubtedly or Flat. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/flat/undoubtedly.
Google Ngram Viewer shows how "flat" and "undoubtedly" have occurred on timeline