Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
wanton [ˈwɔntn] adj (gratuitous) беспричи́нный*беспричи́нен (promiscuous) распу́тный*распу́тен
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.