The antonyms for the word "de sensitizing" are sensitizing, arousing, stimulating, exciting, and motivating. Sensitizing implies causing a person or thing to become more aware of something, or more able to respond to it. Arousing suggests making someone more passionate, interested or even sexually receptive. Stimulating conjures up images of improving or increasing activity, such as metabolism or general stimulation of the senses. Exciting can mean various things, including excitation, arousal or general excitement. Finally, motivating refers to more of a push and inducing action, such as generating inspiration or incentives. The antonyms above offer a variety of different directions one could consider in terms of creating a specific mood or effect.