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 But critics say building routine cases on evidence derived from FISA warrants undermines constitutional protections against unreasonable searches. Eric Tucker, BostonGlobe.com, "How national security surveillance nabs more than spies," 15 Mar. 2020 Require equipment that monitors and detects noise and notifies the owner if noise is unreasonable or in violation of a noise ordinance. Ryan Randazzo, azcentral, "Vacation-rental rules bill killed by Arizona lawmakers," 5 Mar. 2020 The lawsuit alleges that Logan's constitutional rights prohibiting unreasonable search and seizures and cruel and unusual punishment were violated. Sarah Kaufman, NBC News, "Mississippi man who says he was beaten, punched and choked by officers files lawsuit," 4 Mar. 2020 Coin Center, a cryptocurrency advocacy group, explains that the agency’s approach imposes an unreasonable burden on investors. Matthew De Silva, Quartz, "For once, Facebook is the underdog as Libra skepticism mounts," 10 Oct. 2019 The lawsuit was filed last week in US District Court for the Western District of North Carolina alleging civil battery by the United States and unreasonable search by a Transportation Security Administration (TSA) officer. Madeline Holcombe, CNN, "Woman sues TSA after she says an officer groped her during a groin search," 11 Feb. 2020 The fund was originally set at $50 million and rose to $117.5 million last April after Northern District of California judge Lucy Koh called the original number unreasonable and unfair. Lily Hay Newman, Wired, "How to Get Your Yahoo Breach Settlement Money," 8 Feb. 2020 There are so many reasonable questions to ask after this failure, but a number of media observers have chosen instead to raise unreasonable ones. James Freeman, WSJ, "Iowa Voters Younger, More Diverse Than Leading Democratic Candidates," 4 Feb. 2020 The Republicans in Congress, long classed as unreasonable radicals, finally seem like moral heroes. Adam Gopnik, The New Yorker, "Did Lincoln Really Matter?," 3 Feb. 2020

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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Time Traveler for unreasonable

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

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Last Updated

26 Mar 2020

Cite this Entry

“Unreasonable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unreasonable. Accessed 1 Apr. 2020.

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More Definitions for unreasonable


How to pronounce unreasonable (audio)

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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