1. Frighten, alarm, scare, terrify, terrorize, appall all mean to arouse fear in people or animals. To frighten is to shock with sudden, startling, but usually short-lived fear, especially that arising from the apprehension of physical harm: to frighten someone by a sudden noise. To alarm is to arouse the feelings through the realization of some imminent or unexpected danger: to alarm someone by a scream. To scare is to frighten, often without the presence of real danger: Horror movies really scare me. To terrify is to strike with violent, overwhelming, or paralyzing fear: to terrify a city by lawless acts. To terrorize is to terrify in a general, continued, systematic manner, either wantonly or in order to gain control: His marauding armies terrorized the countryside. To appall is to overcome or confound by dread, dismay, shock, or horror: The suffering caused by the earthquake appalled him.