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unreasonable

American  
[uhn-ree-zuh-nuh-buhl, -reez-nuh-] / ʌnˈri zə nə bəl, -ˈriz nə- /

adjective

  1. not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational.

    an unreasonable person.

    Synonyms:
    silly, foolish, senseless
  2. not in accordance with practical realities, as attitude or behavior; inappropriate.

    His Bohemianism was an unreasonable way of life for one so rich.

    Synonyms:
    nonsensical, stupid, absurd, preposterous, silly, foolish, senseless
  3. excessive, immoderate, or exorbitant; unconscionable.

    an unreasonable price; unreasonable demands.

    Synonyms:
    extravagant
  4. not having the faculty of reason.


unreasonable British  
/ ʌnˈriːznəbəl /

adjective

  1. immoderate; excessive

    unreasonable demands

  2. refusing to listen to reason

  3. lacking reason or judgment

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • unreasonableness noun
  • unreasonably adverb

Etymology

Origin of unreasonable

First recorded in 1300–50, unreasonable is from the Middle English word unresonabel. See un- 1, reasonable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“Please refrain from making such unreasonable inquiries or sending emails in the future,” he said in response to Barron’s outreach.

From Barron's

In its lawsuit, the company called the adjustments “arbitrary, capricious, or unreasonable.”

From The Wall Street Journal

Their bill would bar AI developers from releasing models that “create an unreasonable risk of critical harm.”

From The Wall Street Journal

ING said Milieudefensie’s claims were “unrealistic and unreasonable,” adding that it was confident in its climate approach at the time of the suit.

From The Wall Street Journal

They promised to remove unreasonable restrictions on consumption, but didn’t provide further details.

From The Wall Street Journal