truculently

from WordNet (r) 3.0 (2006)

truculently
    adv 1: in an aggressively truculent manner; "they strive for
           security by truculently asserting their own interests"
    2: in a defiantly truculent manner; "the boy looked up
       truculently at his teacher"

from The Collaborative International Dictionary of English v.0.48

Truculently \Tru"cu*lent*ly\, adv.
   In a truculent manner.
   [1913 Webster]