Fear refers to an unpleasant emotional reaction experienced in the face of perceived danger. It builds quickly in intensity and helps to organize the person's responses to threats from the environment.
The degrees of this passion, beginning with the most moderate, may be thus expressed, apprehension, fear, dread, fright, terror. Fear is an uneasiness of the mind, upon the thought of future evil likely to befall us. (Locke) Where no hope is left, is left no fear. (Milton).That which causes, or which is the object of, apprehension or alarm; source or occasion of terror; danger; dreadfulness
Other /More definition:
fear refers to an alarm reaction to current danger or life-threatening emergencies that is marked by strong escape-oriented tendencies and a surge in the sympathetic nervous system.
Other /More definition:
Fear can be defined as: (1) an emotion of an immediate alarm reaction to present/current danger or life-threatening emergencies. (2) an innate, almost biologically based alarm response to a dangerous or life-threatening situation. Fear is marked by strong escape-oriented tendencies and a surge in the sympathetic nervous system.