Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
dangerously [ˈdeɪndʒrəslɪ] adv с ри́ском
dangerously close (to) в опа́сной бли́зости (к +dat)
he is dangerously ill он опа́сно бо́лен
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: