obtuseness
🇺🇸
/əbˈtuːsnəs/
🇬🇧
/əbˈtjuːsnəs/
A lack of quickness in understanding or reacting to things.
His obtuseness to the teacher's hints made it clear he wasn't getting the lesson.
他對老師暗示的遲鈍表明他沒有理解課程。