Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
important [ɪmˈpɔːtənt] adj ва́жный*ва́жен (influential, person) ва́жный#
it's not important э́то нева́жно
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: