"Quiet despair" refers to feeling deeply sad or hopeless, but not expressing it openly or loudly. It is a way of describing a person who is silently suffering or feeling a heavy sadness within themselves. Full definition
At one point in the sickly sweet Lars And The Real Girl, a fresh - faced young woman who still has barrettes in her hair and hearts on her socks weeps in quiet despair because an officemate has killed her teddy bear. (film.avclub.com)
First, I want to express my shock and quiet despair over the events in Dallas this weekend. (investorsinsight.com)