unacceptable Definition in the Cambridge English Dictionary
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Definition of “unacceptable” - English Dictionary

Definition of "unacceptable" - American English Dictionary

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unacceptableadjective

 us   /ˌʌn·ɪkˈsep·tə·bəl/
too ​bad to be ​accepted, ​approved of, or ​allowed to ​continue: These ​mistakes are unacceptable. The ​proposal is unacceptable to ​theater owners.
(Definition of unacceptable from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "unacceptable" - British English Dictionary

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unacceptableadjective

uk   /ˌʌn.əkˈsep.tə.bl̩/  us   /-t̬ə-/
B2 too ​bad to be ​accepted, ​approved of, or ​allowed to ​continue: The ​teachers' ​union has ​described the ​latestpayoffer as unacceptable. The taking of ​hostages, said the ​president, was ​totally unacceptable under any ​circumstances. The ​reportfound what it ​described as "unacceptable ​levels of ​airpollution" in several ​majorcities.
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(Definition of unacceptable from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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