1. making someone less sensitive to or less affected by something, especially through repeated exposure
Usage: present participle of desensitise; British spelling; American spelling is 'desensitizing'
2. reducing or eliminating an emotional or physical response to a stimulus through gradual exposure or treatment
Usage: psychology and medical contexts

Examples

• Watching too much violence on television can be desensitising to children.
• The therapist used gradual exposure as a method of desensitising patients to their phobias.
• Repeated exposure to the same advertisement is desensitising consumers to its message.
• Social media is desensitising people to tragic news events.
• The training program aims at desensitising firefighters to high-stress situations.
• Constant notifications are desensitising users to urgent alerts.