Source : Webster's Revised Unabridged Dictionary (1913)

Belligerently \Bel*lig"er*ent*ly\, adv.
   In a belligerent manner; hostilely.

Source : WordNet®

belligerently
     adv : in a belligerent hostile manner; "he pushed her against the
           wall belligerently" [syn: {hostilely}, {with hostility}]