The crossword solution for the term 'Cause of Dejection' is WOE, which is a three-letter word. WOE is an expression of grief or sorrow, and is often used to describe a feeling of deep distress or misery. It is commonly used to refer to a situation that causes great sadness or despair. In this context, it can be used to describe the cause of dejection, which is a state of being downcast or depressed.