Source : Webster's Revised Unabridged Dictionary (1913)

Insulting \In*sult"ing\, a.
   Containing, or characterized by, insult or abuse; tending to
   insult or affront; as, insulting language, treatment, etc. --
   {In*sult"ing*ly}, adv.

   Syn: Insolent; impertinent; saucy; rude; abusive;
        contemptuous. See {Insolent}.

Source : WordNet®

insultingly
     adv 1: in a disrespectful and insulting manner; "he behaves
            insultingly toward his parents"
     2: in an unfair and insulting manner; "this internationally
        known writer was foully condemned by the Muslim
        fundamentalists" [syn: {foully}]