Dark
Both words in one sentence
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Occasionally a bit of a deconstruction, as his "purely rational" decisions often come across as cold or even cruel, and may be leading him to become a dark lord.
Source: The Spock - Fantasy All Along: A dark example from the standalone novel The Burning Court: The detective comes up with an rational explanation for the murder mystery in the penultimate chapter.
Source: Creator / John Dickson Carr - The former has a gritty Used Future look and both the dark side and the light side of the Force favor instinct over reasons, compared to the rational and utopian Star Trek.
Source: Technician vs. Performer
Cite this Source
Rational and Dark. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/dark/rational
Dark & Rational. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/dark/rational>.
Rational or Dark. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/dark/rational.
Google Ngram Viewer shows how "dark" and "rational" have occurred on timeline