How to use irrational in a sentence
40 example sentences · adjective, noun
Irrational means not rational; unfounded, nonsensical or wrong-headed. Example: “The number π is irrational.”
Examples of irrational by meaning
adjectiveNot rational; unfounded, nonsensical or wrong-headed.
- an irrational decision
adjectiveOf a real number, that cannot be written as the ratio of two integers.
- The number π is irrational.
nounA real number that can not be expressed as the quotient of two integers, an irrational number.
- The square root of 2, which was the first irrational to be discovered, was known to the early Pythagoreans, and ingenious methods of approximating to its value were discovered.1946, Bertrand Russell, History of Western Philosophy, I.24
More sentences with irrational
- Rational numbers are a countable set, so almost all numbers are irrational.From the entry almost all
- When the irrational exuberance finally ended and the central bank took away the punch bowl, the business world belatedly sobered up.From the entry sober up
- President Nixon tried to make leaders of communist bloc countries believe he was a volatile, irrational pugilist.2025 April 16, Laurent Belsie, “Why Trump’s ‘madman theory’ tactics could run aground amid trade reversals”, in The Christian Science…. From the entry pugilist
- Massacres that take place during war often seem to be rooted in irrational emotion.2020 October 15, Frank Pasquale, “‘Machines set loose to slaughter’: the dangerous rise of military AI”, in The Guardian. From the entry root
- Luo Ji slowly came to be seen as an irrational monster and a mundicidal despot.2017 March 14, Cixin Liu, The Three-Body Problem Series: The Three-Body Problem, The Dark Forest, Death's End, Tor Books, →ISBN. From the entry mundicidal
- Mine is ovophobia: I have an irrational fear of eggs, particularly the hard-boiled variety.2017, Killian Fox, The Gannet's Gastronomic Miscellany, London: Mitchell Beazley, page 136. From the entry ovophobia
- Epiplaphobia as the name indicates is the extreme, irrational and often unwarranted fear of furniture.2015 November 11, “Fear of Furniture Phobia – Epiplaphobia or Furniturephobia”, in FearOf.net. From the entry epiplaphobia
- Suggestions that those leaders are irrational and their decisions unfathomable are remarkably shallow.2013 April 9, Andrei Lankov, “Stay cool. Call North Korea's bluff.”, in The New York Times, New York, N.Y.: The New York Times Company…. From the entry unfathomable
- Jim suffers from bananaphobia, an irrational fear of the bendy, yellow fruit!2012, Nuts, page 22. From the entry bananaphobia
- Too much information causes stress and confusion and makes us do irrational things.2010, Kevin Duncan, quoting John Naish, “Affluenza, Herds and Quirkology: Mysterious Consumer Behaviour”, in Marketing Greatest Hits: A…. From the entry infobesity
- I've seen many furries holding long, irrational grudges and playing all-too-human social politics.2007 August 23, Warren Forest, “What have you learned from being furry?”, in alt.lifestyle.furry (Usenet). From the entry furrydom
- Those who suffer enochlophobia, demophobia or ochlophobia–the fear of crowds–are not being entirely irrational.2003 January 31, The Daily Telegraph, Sydney. From the entry ochlophobia
- Araneophobia, or an irrational fear of spiders, is common among people in the United States.2002 July, Harry E. Williams, Robert G. Breene, Riley S. Rees, Karen M. Vail, Carl Jones, “Introduction”, in The Black Widow Spider, The…. From the entry araneophobia
- I wondered what was at the root of Shingo's catoptrophobia - his irrational dread of mirrors.1999 June 28, Vctr113062 [username], “[TK3 fanfic] "Phoenix" Ch. 17, 2/3”, in rec.games.video.sony (Usenet). From the entry catoptrophobia
- You know that guns were not part of the plan, that Bradley was illusional, irrational, crazy thinking.”1987 June 18, Lyndsey Layton, “Jury weighs insanity issue in Chandler murder trial”, in The Recorder, 195th year, number 143, Greenfield…. From the entry paranoid-personality disorder
- The chattering, irrational brute of the subconscious clothes itself in the tattered garments of rationality and idealism.1919, Boris Sidis, The Source and Aim of Human Progress. From the entry tattered
- Man introduces reason into the world of Nature, destroying irrational struggle and waste.1905, Leo Tolstoy, The Complete Works of Count Tolstoy, page 523. From the entry irrationality
- It might cause shame to know on an intellectual level that this asphyxiating fear is, in reality, irrational.2024, Siri Helle, The Emotion Trap. From the entry asphyxiating
- Editor, this seems confusing because if the fear is irrational, why is the source of fear identified in reality?2021 July 14, Les Archer, “Not only Indians know fear, live in fear”, in Kaieteur News, Georgetown, archived from the original on 21 Jul…. From the entry Burnhamism
- Clinically, it presents with anxiety disorders such as irrational fear of getting renal failure where it is also known as albuminurophobia.2020 August 6, Rabea Ahmed Gadelkareem with Nashwa Mostafa Azoz, Ahmed Reda, Ahmed Abdelhamid Shahat, Mohamed Farouk Abdelhafez, Amr Abou…. From the entry albuminurophobia
- Furniture phobia (or epiplaphobia) as the name indicates is the extreme, irrational and often unwarranted fear of furniture.2017 July 22, Paul Philips, “Fear of furniture”, in Quora. From the entry epiplaphobia
- The boy was in desperate need of help due to a most irrational fear of stepmothers, also known as novercaphobia.2013, Gitty Daneshvari, School of Fear: The Final Exam, →ISBN. From the entry novercaphobia
- They can be as prone to lipophobia (the irrational fear of fat) as the population as a whole.2012, Ellyn Satter, How to Get Your Kid to Eat: But Not Too Much, page 135. From the entry lipophobia
- The existence of animal spirits does not imply that "irrational psychology" is the controlling factor in business and economics.2005, Roger S. Frantz, Two minds: intuition and analysis in the history of economic thought, page 91. From the entry animal spirits
- The swaggering rap royal is widely reported to suffer from coulrophobia, an irrational fear of the red-nosed, versized-shoe-wearing, greasepainted circus buffoons.2002 Jared Paul Stern, with Paula Froelich and Chris Wilson, "Send out the Clowns", Page Six (NYT). From the entry coulrophobia
- I.e. they have an irrational fear of irrational fear.2000 June 22, C.J.W., “Re: Why Heterosexuals should not be in scouting”, in rec.scouting.issues (Usenet). From the entry homophobophobia
- Let r ≥ 3 and let f be a Cʳ critical circle map with arbitrary irrational rotation number.1999 December, Edson de Faria, Welington de Melo, “Rigidity of critical circle mappings I”, in Journal of the European Mathematical…. From the entry Epstein class
- There certainly are some cases in which a person's failure to give weight to his or her future interests is irrational.1998, Thomas Scanlon, What we owe to each other, Harvard University Press, page 30. From the entry give weight
- Lending at 5% with a 20-year risk profile is irrational without security backing equal to twice the total loan.1993, Business Review Weekly: BRW. - Volume 15, Issues 1-7, page 106. From the entry risk profile
- Stokes has discovered any sentimental or slipshod or irrational tremendosity which warrants such squalidity of rhetoric—or such paucity of clear thinking.1969, The New York Times Book Review, page 13. From the entry tremendosity
- Shall it be governed theocratically by irrational beliefs and clerical arbitrariness, or nomocratically by rational laws and civic right?1904 [1899], Ernst Haeckel, translated by Joseph McCabe, Wonders of life, published 1905. From the entry nomocratically
- There’s even a name to describe the irrational dread of the date: paraskevidekatriaphobia — a specialized form of triskaidekaphobia, a fear of the number 13.2021 August 12, Christobel Hastings, “Why is Friday the 13th unlucky? The cultural origins of an enduring superstition”, in CNN. From the entry triskaidekaphobia
- From a societal perspective, rent seeking is irrational as resources are wasted by being diverted away from social accumulation for the sake of individual accumulation.2020, Kurt von Seekamm Jr., Rent Seeking and Human Capital. From the entry rent-seeking
- Alektorophobia, like metrophobia (the fear of poetry) or the disorder nomophobia (the fear of being out of cell-phone contact), is completely irrational.2014, Blythe Woolston, edited by Leah Wilson, Divergent Thinking: YA Authors on Veronica Roth's Divergent Trilogy, page 115. From the entry nomophobia
- Let's be honest about the horseburger thing: public outrage is based on an essentially irrational inconsistency about which animals we eat and which we don't.2013, James Kirkup (The Daily Telegraph), Horseburgers: it's OK to eat horses, but remember to say thank you. From the entry horseburger
- "Irrational Greed: Chasing Pennies With Dollars"2012, L.G. Weinzimmer, J. McConoughey, The Wisdom of Failure: How to Learn the Tough Leadership Lessons Without Paying the Price. From the entry chase pennies with dollars
- The colonisers have already declared themselves to be rational, thoughtful, and cultured, in opposition to the colonised who are irrational, passionate, and primitive.2004, Eleanor Bell, Gavin Miller, Scotland in Theory: Reflections on Culture & Literature, page 206. From the entry inferiorism
Meaning of irrational
- adjective Not rational; unfounded, nonsensical or wrong-headed.
- adjective Of a real number, that cannot be written as the ratio of two integers.
- noun A real number that can not be expressed as the quotient of two integers, an irrational number.
Questions about irrational in a sentence
- How do you use irrational in a sentence?
- Irrational is used as an adjective and noun. For example: “The number π is irrational.”
- What is a short sentence with irrational?
- “an irrational decision”
- What does irrational mean?
- Irrational means not rational; unfounded, nonsensical or wrong-headed.
Source and license
Adapted from Wiktionary: irrational (page history and authors) and the entries each sentence comes from. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws chose the sentences, left out offensive ones and quotations older than 1900, and marked the word in each. Wiktionary data of 2026-09-02.
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Cite this page: “How to use irrational in a sentence.” Word.ws, https://word.ws/sentences/irrational. Based on Wiktionary, CC BY-SA 4.0.
