- (coll.) thickhead
- (coll.) thick skull (i.e. the brain of a thickhead)
Generated: This informal expression refers to a person who is stubborn, slow to understand, or lacks intelligence. It conveys a sense of frustration toward someone's inability to grasp ideas quickly.
He is really a thickhead; no matter how I explain, he just doesn't understand.
Generated: Similar to the first meaning, this colloquial term describes someone who is not easily persuaded or who refuses to change their mind. It emphasizes a stubborn nature rather than a lack of intelligence.