F0060700 (fîr′səm)adj.1. Causing or capable of causing fear: "The Devil is a fearsome enemy"(Jimmy Breslin).2. Fearful; timid.fear′some·ly adv.fear′some·ness n.Thesaurus
Adv.
1.
fearsomely - in a fearsome manner; "a sabre slammed fearsomely through the thicket in all directions"