Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
permissible [pəˈmɪsɪbl] adj (action, behaviour) допусти́мый/допусти́м , позволи́тельный*позволи́телен
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: