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Definitions

rational

[rash-uh-nl, rash-nl] / ˈræʃ ə nl, ˈræʃ nl /
ADJECTIVE
realistic; of sound mind
Synonyms
STRONGEST
analytical balanced deliberate enlightened impartial intelligent judicious levelheaded logical lucid normal prudent reasonable sane sensible sober stable thoughtful wise
STRONG
calm cool intellectual knowing objective reasoning sound synthetic thinking
WEAK
all there cerebral circumspect cognitive collected deductive discerning discriminating far-sighted perspicacious philosophic ratiocinative reflective sagacious together well-advised
Antonyms
STRONGEST
careless confused foolish idiotic illogical insane irrational nonsensical senseless stupid thoughtless unbalanced unintelligent unreasonable unstable unsystematic unwise
STRONG
agitated excited
WEAK
ridiculous unrealistic unsound

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Lewis admitted some of the witness stories were compelling and "would have an effect" on him as he pondered them before his rational self took over.

From BBC • Apr. 3, 2026

“The return of volume growth and more rational capacity behavior are important milestones, but stabilization alone will not be sufficient to unlock Lamb Weston’s full earnings potential,” Starboard wrote in the letter, viewed by Barron’s.

From Barron's • Apr. 1, 2026

The trick is to make truthful revelation the rational choice and misrepresentation unprofitable.

From The Wall Street Journal • Mar. 20, 2026

Planning is for weaklings, rational analysis is disdained, the amygdala and the gut replace the cerebral cortex.

From Salon • Mar. 14, 2026

It wasn’t that Van Riper hated all rational analysis.

From "Blink" by Malcolm Gladwell

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.