Meaning of “unreasonable” in the English Dictionary

"unreasonable" in British English

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uk /ʌnˈriː.zən.ə.bəl/ us /ʌnˈriː.zən.ə.bəl/

B2 not fair or acceptable:

unreasonable demands
[ + to infinitive ] It seems unreasonable to expect one person to do both jobs.

More examples

  • I find your attitude completely unreasonable.
  • She divorced him on the grounds of unreasonable behaviour.
  • If he expects you to do that, I think he's being completely unreasonable.
  • I hope he doesn't think I'm being unreasonable.
  • He's always making unreasonable demands on my time.
adverb uk /ʌnˈriː.zən.ə.bli/ us /ʌnˈriː.zən.ə.bli/

(Definition of “unreasonable” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unreasonable" in American English

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us /ʌnˈri·zə·nə·bəl/

not based on or using good judgment; not fair:

It’s unreasonable to expect him to work every weekend.
adverb us /ʌnˈri·zə·nə·bli/

He thinks the cops acted unreasonably.

(Definition of “unreasonable” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"unreasonable" in Business English

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uk /ʌnˈriːzənəbl/ us

not fair or acceptable:

A merchant is not required to satisfy a customer's unreasonable demands.
be unreasonable for sb/sth to do sth It is not unreasonable for technical jobs to be filled by people with particular skills honed in industry.
be unreasonable to expect/suggest/think sth It would be unreasonable to expect annuity rates to remain high.
an unreasonable cost/expense/price

(Definition of “unreasonable” from the Cambridge Business English Dictionary © Cambridge University Press)