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.

Is this a rational way to structure the U.S. government?

From Slate • Jun. 29, 2026

So a lot of people think bubbles are an ideological thing, instead of a material thing with reasons and motives that are totally rational — and that we can short-circuit.

From Salon • Jun. 22, 2026

As the rational foundations of clinical research continue to be challenged and undermined, her book reminds us of science’s singular ability to address problems of civilizational importance.

From The Wall Street Journal • Jun. 21, 2026

Adoration of leaders can be dangerous and should not be a part of rational analysis.

From Barron's • Jun. 12, 2026

“It doesn’t seem the most rational or reasonable route to take, Nighthand.”

From "Impossible Creatures" by Katherine Rundell

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