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

Keep scrolling for more

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

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 Lawyers for the whistleblower say two years is unreasonable. Kristin Broughton, WSJ, "Whistleblower Challenges SEC Over Delay on Award Decision," 30 Apr. 2019 Likewise, a good local builder will have valuable input on which materials make sense for your region, and will rein in ideas that are unreasonable. Jeff Layton, The Seattle Times, "Your PNW vacation home: How to pick a site and the right crew," 29 Mar. 2019 European officials are also concerned that the British could make, in their view, unreasonable demands over the one part of the agreement still to be settled, a political declaration of the two sides’ plans for their future relationship. Stephen Fidler, WSJ, "European Governments Bewildered by U.K.’s Brexit Turmoil," 18 Nov. 2018 Jurors reasoned that the Rams negligently permitted and maintained a dangerous condition to exist in the Dome, thereby creating an unreasonable risk of injury to players. Michael Mccann, SI.com, "Reggie Bush’s Trial Win vs. Rams Could Be Precedent for More Athletes Filing Injury Lawsuits," 13 June 2018 Although voting systems without auditable paper trails present an unreasonable risk of potentially depriving citizens of their votes, such machines are sometimes still in use in some jurisdictions. Derek Hawkins, Washington Post, "The Cybersecurity 202: We surveyed 100 security experts. Almost all said state election systems were vulnerable.," 21 May 2018 Zachary Cruz claims he was treated unfairly, including an unreasonable bail set at $500,000, was required to wear a restraint vest 24 hours a day and was subjected to sleep deprivation tactics in jail. Curt Anderson, The Seattle Times, "Prosecutors want trial date in Florida school shooting," 8 Jan. 2019 What Lindsay wanted was to have her love story documented, and that's not an unreasonable request. Christopher Rosa, Glamour, "Rachel Lindsay Says She's a 'Little Pissed Off' About Becca Kufrin's Bachelorette Ending," 7 Aug. 2018

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.

See More

First Known Use of unreasonable

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

Keep scrolling for more

Learn More about unreasonable

Dictionary Entries near unreasonable








Statistics for unreasonable

Last Updated

19 Jun 2019

Look-up Popularity

Time Traveler for unreasonable

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

See more words from the same century

Keep scrolling for more

More Definitions for unreasonable



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

Keep scrolling for more

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).


showing courage and determination

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a closeup of a sunflower
  • Which of the following words means “of or relating to summer”?
Spell It

Can you spell these 10 commonly misspelled words?


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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