Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

truculence
     n : obstreperous and defiant aggressiveness [syn: {truculency}]