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.

All of this means that people who show up sick to the hospital aren’t told what they’re sick with for days or nearly weeks in an area where outsiders are seen with rational skepticism.

From Slate • Jun. 9, 2026

Today I’m breaking down why I think the market’s meteoric rise is still rational, and how the software sector proves that investors are grounded in reality.

From Barron's • Jun. 8, 2026

The idea that valuing this in a rational way for tax purposes is somehow too hard is an insult to our intelligence.

From MarketWatch • Jun. 5, 2026

According to China's Cyberspace Administration, the campaign's goal was to address negativity and "create a more civilised and rational online environment".

From BBC • Jun. 5, 2026

Surely there was a rational explanation for all the incidents at Ashley’s.

From "Sir Fig Newton and the Science of Persistence" by Sonja Thomas

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