In theory
In theory adverb - With regard to fundamentals although not concerning details.
Reasonably and in theory are semantically related. In some cases you can use "Reasonably" instead an adverb phrase "In theory".
Reasonably
Reasonably adverb - With good reason or courtesy.
In theory and reasonably are semantically related. Sometimes you can use "In theory" instead an adverb "Reasonably".
Mutual synonyms
Both terms in one sentence
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Million-to-One Chance: A few myths they said were reasonably plausible in theory, but to do it by accident or even on purpose requires the right alignment of stars.
Source: Series / MythBusters
Cite this Source
Reasonably and In theory. (2016). Retrieved 2026, July 27, from https://thesaurus.plus/related/in_theory/reasonably
In theory & Reasonably. N.p., 2016. Web. 27 Jul. 2026. <https://thesaurus.plus/related/in_theory/reasonably>.
Reasonably or In theory. 2016. Accessed July 27, 2026. https://thesaurus.plus/related/in_theory/reasonably.
Google Ngram Viewer shows how "in theory" and "reasonably" have occurred on timeline