From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ruffianly \Ruf"fian*ly\, a.
Like a ruffian; bold in crimes; characteristic of a ruffian;
violent; brutal.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
ruffianly
adj 1: violent and lawless; "the more ruffianly element"; "tough
street gangs" [syn: ruffianly, tough]