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Definitions

unreasonable

[uhn-ree-zuh-nuh-buhl, -reez-nuh-] / ʌnˈri zə nə bəl, -ˈriz nə- /
ADJECTIVE
not logical or sensible
Synonyms
STRONGEST
absurd arbitrary biased contradictory foolish illogical inconsistent irrational preposterous senseless silly stupid wrong
WEAK
all wet capricious erratic fallacious far-fetched full of hot air headstrong incoherent incongruous inconsequential invalid loose mad nonsensical off the wall opinionated quirky reasonless thoughtless unreasoned vacant
Antonyms
STRONGEST
circumspect consistent correct intelligent logical rational reasonable right sensible serious wise
WEAK
cheap economical low plain practical pragmatic realistic
ADJECTIVE
extravagant; beyond normal limits
Synonyms
STRONGEST
arbitrary excessive exorbitant extreme illegitimate improper inordinate senseless unconscionable undue unfair unjust unjustifiable unlawful unwarranted wrongful
WEAK
absonant costing an arm and a leg dear extortionate far-out immoderate intemperate out of bounds overkill overmuch peremptory posh pricey steep stiff too great too much too-too uncalled-for unrightful unwarrantable up to here way-out
Antonyms
STRONGEST
authorized decent ethical fair good just justifiable legal moderate moral rational reasonable right sensible unprejudiced warranted
WEAK
cheap economical logical low plain practical pragmatic realistic

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.

And he wanted to show that the state Supreme Court’s ruling that Pitchford’s lawyer had waived relief was not merely debatable but unreasonable even by the AEDPA’s demanding standards.

From Slate • Apr. 10, 2026

“That is not unreasonable for a business of this quality,” he said.

From MarketWatch • Apr. 9, 2026

The country's parliament speaker Mohammad Bagher Ghalibaf posted on X that the "workable basis on which to negotiate" had already been violated, making further talks "unreasonable".

From Barron's • Apr. 9, 2026

It’s where I watched Barack Obama get elected twice, the Lakers win back-to-back championships, and where I indulged in countless night caps and an unreasonable amount of all-you-can-eat split pea soup.

From Los Angeles Times • Mar. 26, 2026

“I am the breadwinner in this family, and I don't think it's unreasonable for me to spend at least a portion of my salary however the hell I see fit.”

From "Black Swan Green" by David Mitchell

Vocabulary lists containing unreasonable

"The Southpaw"

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Chronically Dolores

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Part 3 Vocabulary (Unit 2)

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