Hi,
I think we are talking about no desire within the context of depression. Sometimes, you do not want to exist. And that status can be almost invariable for months. I am disabled because of a car accident I had when I was a teen. Around my twenties I had a series of surgeries. One of the consequences was an infection that would not go away. I had to had several additional surgeries to clean the infection that did not work. I was sent home with antibiotics and at that point I just felt I wanted to die. I could not walk anymore and on top of that, my last five years had been spent in the hospital, dealing with various health issues caused by the accident. I saw my future would be ugly. I have no desire, no motivation for living. I was trying to study but the illnesses would not allow me studying. I stop eating. I remained in bed waiting for death. It is a very profound sentiment. You cannot snap your fingers and say:"I will play ukelele". Believe me.