'Impermissible' definitions:
Definition of 'impermissible'
From: WordNet
adjective
Not permitted; "impermissible behavior" [ant: allowable, permissible]
adjective
Not allowable
Definition of 'Impermissible'
From: GCIDE
- Impermissible \Im`per*mis"si*ble\, a. Not permissible. [1913 Webster]