Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
Japanese [dʒæpəˈniːz] adj япо́нский#
n inv (person) япо́нец*-нка#] (LING) япо́нский*язы́к#
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: