Mad
Mad adjective - Having or showing a very abnormal or sick state of mind.
Usage example: the man who thinks he's been turned into a bug is clearly mad
Rational
Rational adjective - According to the rules of logic.
Usage example: insisted there was a rational explanation for the strange creaking noises and that there were no such things as ghosts
Both words in one sentence
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Obfuscating Insanity: Smolkin has a bizarre manner and claims to be mad, but his actions are entirely rational bordering on Only Sane Man.
Source: Film / The Undead -
The Eaters of the Dead do exactly that in service to a mad Firstborn...who went rational again at some point and just wants to be accepted by her family again, by proving her "new Tribe" have a vital purpose in hunting malignant undead.
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He may be a Mad Scientist, but his thinking is entirely rational.
Source: Room Full of Crazy
Cite this Source
Rational and Mad. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/mad/rational
Mad & Rational. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/mad/rational>.
Rational or Mad. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/mad/rational.
Google Ngram Viewer shows how "mad" and "rational" have occurred on timeline