ennui

a feeling of weariness or dissatisfaction.

Honestly, the roller derby left me with a kind of ennui.
Help me, I drown in a sea of ennui.
If you knew Marie, you knew ennui.
The house was filled with smoke... and ennui.
People say I can't deliver! Well I can deliver ennui! No one can deliver ennui like me.
Often, when I feel ennui, I have trouble saying why.
Sheila was not alone; she had ennui!