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impermissible

adjective
 
 
/ˌɪm.pəˈmɪs.ə.bl̩/ US  /-pɚ-/ formal

Definition

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)
Focus on the pronunciation of impermissible