The Collaborative International Dictionary of English v.0.48:

Ruffianly \Ruf"fian*ly\, a.
   Like a ruffian; bold in crimes; characteristic of a ruffian;
   violent; brutal.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ruffianly
    adj 1: violent and lawless; "the more ruffianly element"; "tough
           street gangs" [syn: ruffianly, tough]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "ruffianly":
   bad, boorish, carlish, churlish, cloddish, clownish, disorderly,
   disruptive, hooliganish, improper, loobyish, loutish, lubberly,
   lumpish, misbehaving, naughty, not respectable, off-base,
   out-of-line, raffish, roughneck, rowdy, rowdyish, unbehaving,
   yokelish