Noun: obtuseness ub't(y)oos-nus or ób't(y)oos-nus
- The quality of being slow to understand
"His obtuseness to social cues often led to awkward situations";
- dullness
- The quality of lacking a sharp edge or point
"The obtuseness of the scissors made cutting fabric difficult"
Type of: bluntness, daftness [informal], dullness, feeblemindedness, stupidity
Antonym: acuteness