1. The quality or state of being obtuse; lack of sharpness or quickness of mind; dullness.
Usage: Plural form of obtusity; Formal or literary usage
2. The quality of being blunt or not sharp; the state of having a rounded or dull edge or point.
Usage: Geometric or physical sense; Less common in everyday usage

Examples

• His obtusities in understanding the assignment frustrated the teacher.
• The obtusities of the blade made it unsuitable for precise cutting.
• She displayed remarkable obtusities when it came to social cues.
• The architect criticized the obtusities of the building's design.
• His obtusities prevented him from grasping the subtle implications of the argument.
• The obtusities of the pencil point made writing difficult.