fearsome(frightening, especially in appearance) adjective [UK: ˈfɪə.səm] [US: ˈfɪr.səm]I should be fighting less fearsome enemies. = Debería estar luchando contra enemigos menos temibles.
frightful(full of that which causes fright) adjective [UK: ˈfraɪt.fəl] [US: ˈfraɪt.fəl]
temibleadverb
scary(causing fear or anxiety) adverb [UK: ˈskeə.ri] [US: ˈske.ri]