Search Result for "impermissible":
Wordnet 3.0

ADJECTIVE (2)

1. not permitted;
- Example: "impermissible behavior"

2. not allowable; 



The Collaborative International Dictionary of English v.0.48:

Impermissible \Im`per*mis"si*ble\, a.
   Not permissible.
   [1913 Webster]