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English definition of “impermissible”

impermissible

adjective     /ˌɪm.pəˈmɪs.ə.bl̩/ US  /-pɚ-/ formal
not allowed: There are certain topics of conversation that are impermissible in polite society.Forbidding and banning things
(Definition of impermissible adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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