ˌən-ˈrēz-nə-bəl
1
as in irrational
having no basis in reason or fact
an unreasonable assumption
Synonyms & Similar Words
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Antonyms & Near Antonyms
2
as in unreasoning
not using or following good reasoning
an unreasonable respect for a man who did not deserve it
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
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Recent Examples of unreasonable
The attorney general’s interpretation, the court said, was not unreasonable or capricious, merely different from the administrative law judge’s.
—
Encyclopedia Britannica, 22 Apr. 2026
However, Levenson and Jackson did not feel the decision took an unreasonable amount of time.
—Elizabeth Wolfe, CNN Money, 21 Apr. 2026
The Fourth Amendment prohibits unreasonable search and seizure by the government.
—Anne Toomey McKenna, The Conversation, 21 Apr. 2026
The average person might be prejudiced, and what could be more unreasonable than prejudice?
—Nikhil Krishnan, New Yorker, 20 Apr. 2026
See All Example Sentences for unreasonable
Encyclopedia Britannica, 22 Apr. 2026
However, Levenson and Jackson did not feel the decision took an unreasonable amount of time.
—Elizabeth Wolfe, CNN Money, 21 Apr. 2026
The Fourth Amendment prohibits unreasonable search and seizure by the government.
—Anne Toomey McKenna, The Conversation, 21 Apr. 2026
The average person might be prejudiced, and what could be more unreasonable than prejudice?
—Nikhil Krishnan, New Yorker, 20 Apr. 2026
See All Example Sentences for unreasonable
Recent Examples of Synonyms for unreasonable
Adjective
-
Surveys show a 50-50 divide, but Trump’s real base is his same irrational 30%.—
Sun Sentinel Editorial Board,
Sun Sentinel,
24 Apr. 2026
-
Letting Jinx stay is yet another act of irrational love from Margo.—
Erin Qualey,
Vulture,
15 Apr. 2026
Adjective
-
Bainbridge knew about secrets and unreasoning shame.—
Christopher Tayler,
Harpers Magazine,
27 Jan. 2026
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Let sound political prescience but take the place of an unreasoning prejudice, and this will be done.—
Frederick Douglass,
The Atlantic,
16 Aug. 2017
Adjective
-
Animal advocates have long pushed the city to legalize TNR, saying the practice reduces unwarranted litters, euthanasia and shelter intake while improving the health of feral cats.—
Claire Wang,
Oc Register,
23 Apr. 2026
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The suit does not specify what the unwarranted risk was.—
Milena Malaver,
Miami Herald,
22 Apr. 2026
Adjective
-
Motta had been completely unaware that the accidents Garrison and Alfortish had brought her were illegitimate, Toomey insisted.—
Patrick Radden Keefe,
New Yorker,
13 Apr. 2026
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The only one that can be called truly illegitimate by global and historical standards is the claim to the whole of the South China Sea.—
Anatol Lieven,
Twin Cities,
10 Apr. 2026
Adjective
-
An Amazon spokesperson said workers’ fears were unfounded.—
Greg Bensinger,
USA Today,
23 Apr. 2026
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Experts say those concerns are not unfounded.—
Larry Seward,
Miami Herald,
21 Apr. 2026
Adjective
-
After Howard King was replaced for a time by attorney Mark Geragos, Geragos made a new but equally baseless $40 million demand on behalf of the Cascios.—
Cynthia Littleton,
Variety,
24 Apr. 2026
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The petition seeking a special prosecutor is frivolous, contains baseless allegations and gross misrepresentations of the law.—
Sabrina Franza,
CBS News,
24 Apr. 2026
Adjective
-
What hurts me most is feeling unsupported by my partner.—
Abigail Van Buren,
Boston Herald,
30 Apr. 2026
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What becomes alarmingly evident through the key assumptions check is how many of the current responses expect a quick resolution of the conflict — a supposition that is unsound, or at least unsupported.—
Judd Devermont,
semafor.com,
27 Apr. 2026
Adjective
-
These are invalid measurements made up by MBAs who never played the game on a serious level.—
Voice of the People,
New York Daily News,
21 Apr. 2026
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Out-of-state medicical marijuana cards are invalid in Idaho as the drug is not federally protected for medicinal use.—
Hali Smith,
Idaho Statesman,
20 Apr. 2026
Cite this Entry
“Unreasonable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unreasonable. Accessed 3 May. 2026.
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