The word "de-sensitizes" means to make someone less affected or responsive to something. Antonyms of de-sensitizes could be expressions like to sensitize, to heighten, or to enhance sensitivity. By sensitizing someone, you may make them more aware, alert or reactive to something. Likewise, if an individual heightens someone's emotions or physically enhances their response to something, it becomes the opposite of causing de-sensitization. Thus, sensitizing could be an effective way to undo the effects of de-sensitization by increasing empathy, fostering a better understanding of others' feelings and intensifying experiences.