noun

a sad and depressed state; low spirits.

he was slumped in deep dejection

despondency,depression,downheartedness,dispiritedness,disconsolateness,disappointment,discouragement,desolation,despair,heavy-heartedness,unhappiness,sadness,sorrowfulness,sorrow,dolefulness,melancholy,misery,forlornness,wretchedness,glumness,gloom,gloominess,low spirits,the blues,the dumps,mopery