The Collaborative International Dictionary of English v.0.48:

Truculence \Tru"cu*lence\, Truculency \Tru"cu*len*cy\, n. [L.
   truculentia.]
   The quality or state of being truculent; savageness of
   manners; ferociousness.
   [1913 Webster]

WordNet (r) 3.0 (2006):

truculency
    n 1: obstreperous and defiant aggressiveness [syn: truculence,
         truculency]