Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
bully [ˈbulɪ] n зади́ра m/f
vt трави́ть*(затрави́ть*perf) (frighten) запу́гивать (запуга́ть perf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.