hebetudinous
/ˌhɛbɪˈtuːdɪnəs/
adjective
- Dull, sluggish, or lacking in mental sharpness; slow to understand or respond.
- His hebetudinous expression made it clear he had no idea what the teacher was talking about.
- After staying up all night studying, she felt hebetudinous during the morning exam.
- The long, boring lecture left the entire class feeling hebetudinous.