not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational: an unreasonable person.
not in accordance with practical realities, as attitude or behavior; inappropriate: His Bohemianism was an unreasonable way of life for one so rich.
excessive, immoderate, or exorbitant; unconscionable: an unreasonable price; unreasonable demands.
not having the faculty of reason.
- un·rea·son·a·ble·ness, noun
- un·rea·son·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use unreasonable in a sentence
It alleges OSHA’s decision not to set safety standards about infectious diseases is “unreasonable and unlawful” and a violation of federal law that requires the agency to issue standards for significant health risks.Health-care workers file lawsuit against OSHA, accusing agency of failing to keep them safe | Eli Rosenberg | October 29, 2020 | Washington Post
In its suit, Walmart said it has a robust system for monitoring opioid prescriptions and federal regulators are making unreasonable demands on the chain.Walmart sues government to pre-empt allegations it helped fuel opioid crisis | kdunn6 | October 23, 2020 | Fortune
There are few sure bets in the NFL, and we’re still just four weeks into the season, but it’s not unreasonable to predict — like we have — that the Jets season is all but over.Scoring Is Way Up In The NFL. Which Teams Does That Help? | Josh Hermsmeyer | October 9, 2020 | FiveThirtyEight
If we do the clean energy transition in a really expensive, inefficient manner, it’s going to impose unreasonable, unbearable costs on consumers and businesses and I just don’t think it’s going to work.Inside the Utility Company Lobbying Blitz That Will Hike Electric Bills | by Patrick Wilson, Richmond Times-Dispatch | October 9, 2020 | ProPublica
King sued, alleging the officer’s actions violated his Fourth Amendment right against unreasonable seizure and excessive force.7 big cases the Supreme Court will hear in its new term, explained | Ian Millhiser | October 1, 2020 | Vox
"If it were a matter of life and death, you could not be more obstinate," said her hostess, fretted at her unreasonableness.Alone | Marion Harland
Situated as we were, we did not feel ourselves at liberty to expostulate against the obvious unreasonableness of their demands.
In fact, reasoning unreasonableness was a very frequent condition of George Sand's mind.Frederick Chopin as a Man and Musician | Frederick Niecks
Quite a common characteristic of sick people is unreasonableness.The Eugenic Marriage, Vol. 3 (of 4) | W. Grant Hague
Tinah and Iddeah remained and expostulated with me on the unreasonableness of my anger against them.A Voyage to the South Sea | William Bligh
British Dictionary definitions for unreasonable
immoderate; excessive: unreasonable demands
refusing to listen to reason
lacking reason or judgment
- unreasonableness, noun
- unreasonably, adverb
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