Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
sneaky [ˈsniːkɪ] adj (pej)(person) хи́трый*хитёр (advantage, look) незаме́тный*незаме́тен
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.