Source : Webster's Revised Unabridged Dictionary (1913)

Truculently \Tru"cu*lent*ly\, adv.
   In a truculent manner.

Source : WordNet®

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"