Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
voracious [vəˈreɪʃəs] adj жа́дный*жа́ден
he is a voracious reader он с жа́дностью чита́ет
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: