The Collaborative International Dictionary of English v.0.48:

Roisterly \Roist"er*ly\, a.
   Blustering; violent. [R.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Roisterly \Roist"er*ly\, adv.
   In a roistering manner. [R.]
   [1913 Webster]