Definition of impermissible adjective from the Oxford Advanced Learner's Dictionary

 

impermissible

 adjective
adjective
BrE BrE//ˌɪmpɜːˈmɪsəbl//
 
; NAmE NAmE//ˌɪmpɜːrˈmɪsəbl//
 
 
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that cannot be allowed an impermissible invasion of privacy He said that this behaviour was impermissible in a democratic society. The opposition argued that combining state and party posts in this way was impermissible. opposite permissible
See the Oxford Advanced American Dictionary entry: impermissible