hebetude
/ˈhɛbɪˌtud/
noun
- A state of mental dullness, sluggishness, or lack of interest.
- Her hebetude after the illness worried her family, as she usually was very energetic.
- After hours of studying, he fell into a state of hebetude and could barely focus.
- The long, monotonous lecture only increased the class's hebetude.