un·​rea·​son·​able | \ ˌən-ˈrēz-nə-bəl How to pronounce unreasonable (audio) , -ˈrē-zᵊn-ə-bəl\

Definition of unreasonable

1a : not governed by or acting according to reason unreasonable people
b : not conformable to reason : absurd unreasonable beliefs
2 : exceeding the bounds of reason or moderation working under unreasonable pressure

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Other Words from unreasonable

unreasonableness \ ˌən-​ˈrēz-​nə-​bəl-​nəs How to pronounce unreasonableness (audio) , -​ˈrē-​zᵊn-​ə-​bəl-​ \ noun
unreasonably \ ˌən-​ˈrēz-​nə-​blē How to pronounce unreasonably (audio) , -​ˈrē-​zᵊn-​ə-​blē \ adverb

Examples of unreasonable in a Sentence

I told him that I wouldn't pay unless he sent me a replacement. Am I being unreasonable? You are entitled to compensation for unreasonable delays.

Recent Examples on the Web

Safety recalls are necessary when a defect poses an unreasonable risk of accidents or injuries. Freep.com, "FREE PRESS INVESTIGATION: OUT OF GEAR Ford knew Focus, Fiesta models had flawed transmission, sold them anyway," 11 July 2019 Pai's broadband deregulation also eliminated a general prohibition against unjust or unreasonable prices and practices. Jon Brodkin, Ars Technica, "Frontier customer bought his own router—but has to pay $10 rental fee anyway," 2 July 2019 Worry grew about some emergency lurking behind his request, a not unreasonable idea given the last few rocky years. Stacy Torres, Longreads, "How I Became ‘Rich’," 20 June 2019 That is slightly less than the five-year average, and hardly an unreasonable price to pay for a business that reaches its goals more often than not. Charley Grant, WSJ, "Darden Shares Still Offer Bang for the Buck," 20 June 2019 Daily Mail reports that the guest on the receiving end of the unreasonable requests took to a Facebook group to share the back-and-forth. Marci Robin, Allure, "This Bride Told a Wedding Guest to Cover Her Tattoos and Dye Her Hair a Natural Color," 15 June 2019 This is an unreasonable ask, even for the most committed mentors. Prasanna Krishnamoorthy, Quartz India, "What startup mentors can learn from family doctors," 31 May 2019 The 5-4 decision featured two opinions on both sides of whether the practice violates the Fourth Amendment right against unreasonable searches. Bruce Vielmetti, Milwaukee Journal Sentinel, "In Wisconsin case, U.S. Supreme court says police can draw blood from unconscious drivers without warrant," 27 June 2019 Lea alleges that the officers violated his Constitutional right to be free from unreasonable searches and seizures and that Conrad and Hibbs failed to properly train their officers. Andrew Wolfson, The Courier-Journal, "Black teen handcuffed after wide turn sues LMPD for eyeing him as 'perfect target'," 12 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unreasonable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of unreasonable

14th century, in the meaning defined at sense 1a

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Last Updated

17 Jul 2019

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Time Traveler for unreasonable

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

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English Language Learners Definition of unreasonable

: not fair, sensible, or appropriate : not reasonable


un·​rea·​son·​able | \ ˌən-ˈrē-zᵊn-ə-bəl How to pronounce unreasonable (audio) \

Kids Definition of unreasonable

: not fair, sensible, appropriate, or moderate an unreasonable schedule unreasonable behavior an unreasonable fear

Other Words from unreasonable

unreasonably \ -​blē \ adverb



Legal Definition of unreasonable

: not reasonable : beyond what can be accepted: as
a : clearly inappropriate, excessive, or harmful in degree or kind an unreasonable delay an unreasonable restraint of trade
b : lacking justification in fact or circumstance an unreasonable inference especially : irrational sense b the agency decision was unreasonable
c : not supported by a warrant or by a valid exception to a warrant requirement (as when there is reasonable suspicion) and therefore unconstitutional the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violatedU.S. Constitution amend. IV — see also search, seizure

Other Words from unreasonable

unreasonableness noun
unreasonably adverb

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Comments on unreasonable

What made you want to look up unreasonable? Please tell us where you read or heard it (including the quote, if possible).


appealing forcibly to the mind or reason

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