"Complete despair" refers to feeling extremely hopeless or without any hope at all. It is a state of deep sadness or anguish where a person may believe that there is no solution or way out of their problems. Full definition
So he is slowly slipping back into the state of complete despair in which he began his life sentence. (religion-online.org)
There will be moments of complete despair and frustration when you catch yourself wondering if you made the right choice. (gerardadams.com)
Daily duties can bring us to a place of complete despair not knowing how we ever manage it all — «every problem has a solution» as the saying goes, and it's true. (mindbodygreen.com)