Thesaurus.com
Dictionary.com
Showing results for unreasonable. Search instead for un reasonable.
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.

“It’s almost an unreasonable ask if we said, ‘Do more.’”

From The Wall Street Journal • Mar. 26, 2026

It isn’t unreasonable to expect returns of over 50% by the end of this year.

From Barron's • Mar. 19, 2026

The inmate then can be released if the parole board determines they do not pose an unreasonable risk to public safety.

From Los Angeles Times • Feb. 25, 2026

“If the conduct of the plaintiff in light of his own intelligence and information was manifestly unreasonable, he will be denied a recovery.”

From MarketWatch • Feb. 23, 2026

We had all suffered beyond dignity with the loss of two of our group, and the thought of getting one of them back made us almost unreasonable with motivation.

From "The Marrow Thieves" by Cherie Dimaline

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.