Probably
Probably adverb - By reasonable assumption.
Rational and probably are semantically related. In some cases you can use "Rational" instead an adjective "Probably".
Nearby Words: probable, probability
Both words in one sentence
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If they're intelligent and hydrogen-filled, they will probably have a very rational fear of fire.
Source: Living Gasbag -
Some people, when facing a problem, any problem, will suggest X, without even trying to consider some of the other, probably better, and usually more rational solutions. Why?
Source: The All-Solving Hammer - Nine-year-old Inez is probably the most rational and level-headed of the main cast, but is just about guaranteed to throw a fit if called "Nezzie."
Cite this Source
Rational and Probably. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/probably/rational
Probably & Rational. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/probably/rational>.
Rational or Probably. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/probably/rational.
Google Ngram Viewer shows how "probably" and "rational" have occurred on timeline