Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
impractical [ɪmˈpræktɪkl] adj (plan etc) нереа́льный*нереа́лен (person) непракти́чный*непракти́чен
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: