What is the name of the condition that renders adults mute after psychological trauma?

Trauma. If you or a loved one are experiencing trauma symptoms and mutism, EMDR Therapy could be the best choice. I have used this exceptional trauma therapy even in a combat zone with a child who did not speak English and had stopped talking her native language. Don't let it go, the sooner the trauma is treated the less spillover on your life.
Depending. The terms selective mutism and elective mutism are tow of the most frequent terms.