desensitize
desensitise, / ˌdi:ˈsensɪtaɪz; di`sɛnsəˌtaɪz/ v [Tn]
make (a patient, nerve, etc) insensitive or less sensitive to light, pain, etc 使（病人、 神经等）对光、 疼痛等无感觉或不敏感; 使脱敏
desensitize an area of skin 使一块皮肤脱敏
(fig 比喻) people who are morally desensitized 道德观念不强的人.