Impermissible

//ˌɪmpɝˈmɪsɪbl// adj

Definitions

Adjective
  1. 1
    Not permissible; not to be permitted or allowed.

    "Their use was “impermissible not because it is unwise or ineffective, but because [federal law]^([sic]) does not allow it”, the decision explained."

Adjective
  1. 1
    not permitted wordnet
  2. 2
    not allowable wordnet

Etymology

From im- + permissible.

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