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.

Spreads should be wider than normal to add another level of dealer protection as the market mob is anticipated to make decisions that are unmoored from rational analysis.

From Barron's • Jun. 10, 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

And the court continues to conduct itself as though Trump is a rational actor who will hear a no as a no.

From Slate • Jun. 1, 2026

Autumn looks at me with alarm, but I’m just struggling to come up with a rational explanation.

From "Kwame Crashes the Underworld" by Craig Kofi Farmer

Vocabulary lists containing rational

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