The quality of being slow to understand.

synonym: dullness.

Roget 376: insensibility, physical insensibility; obtuseness etc. adj.; palsy, paralysis, paraesthesia [Med.], anaesthesia; sleep etc. 823; hemiplegia^†, motor paralysis; vegetable state; coma.    anaesthetic agent, opium, ether, chloroform, chloral; nitrous oxide, laughing gas; exhilarating gas, protoxide of nitrogen; refrigeration.    ... show more

Dutch: stompzinnigheid
Polish: tępość

The quality of lacking a sharp edge or point.