Desensitize (verb)

1. To make less sensitive or responsive to a stimulus, especially emotionally or physically.
2. To reduce the strength of an emotional or physical response to a stimulus over time.

Origin:

From de- meaning "away from" and sensitize meaning "to make sensitive".

Examples:

1. He was desensitized to violence after serving in the war.
2. The therapy aimed to desensitize her to her fear of flying.
3. The constant exposure to graphic images on TV desensitizes people to violence.
4. The desensitization to the smell of smoke made it hard for him to smell a gas leak.
5. The desensitization to the pain allowed him to continue running despite the injury.