Thesaurus

irrational

adjective

Synonyms & Antonyms of irrational

See the Dictionary Definition 

Learn More About irrational

Time Traveler for irrational

Time Traveler

The first known use of irrational was in the 14th century

See more words from the same century

Thesaurus Entries Near irrational

irradicable

irrational

irrationalities

See More Nearby Entries 

Cite this Entry

“Irrational.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/irrational. Accessed 16 Jan. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on irrational

Nglish: Translation of irrational for Spanish Speakers

Britannica English: Translation of irrational for Arabic Speakers

WORD OF THE DAY

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!