Definitions

1. adjective

having or showing a lack of quickness or sharpness of mind or wit; stupid or foolish

“Some people thought the movie was obtuse and didn’t understand the plot.”

2. noun

a blunt or obtuse tool or instrument, especially a chisel

“The carpenter chose an obtuse chisel to remove the old mortar.”

3. verb

to make (something) blunt or obtuse

“The accident obtused the edge of the knife.”