Find Antonyms

irrationality Antonyms

Opposite of irrationality

Because the opposite of irrationality shifts with each meaning, the 8 antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
JUMP TO:

• noun (Context 1)

The quality or state of being illogical, unreasonable, or lacking sound judgment.

Usage Example

"Behavioral economists study how human rationality influences financial decision-making during market panics."

Strongest
rationality
reason
logic
reasonableness
Strong
sensibleness
common sense
sanity

• noun (Context 2)

In mathematics, the property of a real number whereby it cannot be expressed as the exact ratio of two integers.

Usage Example

"Ancient Greek mathematicians were famously troubled by the discovery of the rationality of the square root of two."

Strongest
rationality
commensurability

Similar words to irrationality

Words similar to irrationality shift depending on context. Common synonyms include:

unreasonableness
illogicality
absurdity
incommensurability
folly
senselessness
foolishness
fallacy
See all synonyms of irrationality

• Nearby Words

irony
irradiate
irrational
irrationality
irrationally
irreconcilable
irreconcilably

Cite this Entry

Wordmom. (2026). Antonyms for Irrationality. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/irrationality
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.