Functional
Functional adjective - Being in effective operation.
Rational and functional are semantically related. In some cases you can use "Rational" instead an adjective "Functional".
Rational
Rational adjective - Having the ability to reason.
Functional and rational are semantically related. Sometimes you can use "Functional" instead an adjective "Rational".
Mutual synonyms
Both words in one sentence
- Jumping Off the Slippery Slope: When a person who was able to be functional or rational despite negative feelings completely abandons it to pursue them.
Source: Straw Angst - Otherwise, those who can't learn to cope with the knowledge on their own are basically doomed to living with a view of the world that's accurate, but not rational or functional, and which causes them to (rightly) be considered insane by their peers.
Source: Magical Underpinnings of Reality
Cite this Source
Rational and Functional. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/functional/rational
Functional & Rational. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/functional/rational>.
Rational or Functional. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/functional/rational.
Google Ngram Viewer shows how "functional" and "rational" have occurred on timeline