unreasonable

adjective

un·​rea·​son·​able
ˌən-ˈrēz-nə-bəl
-ˈrē-zᵊn-ə-bəl How to pronounce unreasonable (audio)
1
a
: not governed by or acting according to reason
unreasonable people
b
: not conformable to reason : absurd
unreasonable beliefs
2
a
: exceeding the bounds of reason, appropriateness, or moderation
working under unreasonable pressure
an unreasonable restraint of trade
b
: lacking justification
an unreasonable inference
unreasonableness
ˌən-ˈrēz-nə-bəl-nəs
-ˈrē-zᵊn-ə-bəl- How to pronounce unreasonable (audio)
noun
unreasonably
ˌən-ˈrēz-nə-blē
-ˈrē-zᵊn-ə-blē How to pronounce unreasonable (audio)
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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The confrontation on a suburban street near an elementary school and a middle school on October 31 has now been cited in a lawsuit arguing that federal immigration agents are violating protesters’ First Amendment rights to free speech, using excessive force and making unreasonable seizures. Jason Kravarik, CNN Money, 13 Nov. 2025 Officers are able to use loitering laws as general warrants to circumvent individuals’ constitutional right to be protected from unreasonable searches and seizures, Wood said. Alex Brizee, Idaho Statesman, 10 Nov. 2025 The class counsel has argued that objectors are raising either points that were already decided, inappropriate for this forum, or unreasonable to address. Daniel Libit, Sportico.com, 5 Nov. 2025 According to court documents, the grand jury accused Childers, while acting as sheriff, of using unreasonable and excessive force on several people who were not resisting an arrest or posing a threat, injuring them. Kacen Bayless, Kansas City Star, 5 Nov. 2025 See All Example Sentences for unreasonable

Word History

First Known Use

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

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

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Cite this Entry

“Unreasonable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unreasonable. Accessed 18 Nov. 2025.

Legal Definition

unreasonable

adjective
un·​rea·​son·​able
: 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
unreasonableness noun
unreasonably adverb

More from Merriam-Webster on unreasonable

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