adjective
obtuse
ub-TOOS/əbˈtuːs/
Blunt rather than sharp or pointed.
The blue pencil has an obtuse tip beside the sharply pointed red one.

Etymology
Beating against something gives the image of blunting it. Physical dullness became a metaphor for mental dullness: an obtuse person lacks sharpness of understanding or perception.
In context
I have more of the obtuse than the acute in me; but repeat the case over again,
More examples
- Under magnification, the needle's worn tip looks obtuse.
- The drawing shows a blade with an obtuse tip.
- The flower's petals are obtuse at their outer ends.
Forms
obtuse · more obtuse · most obtuse
obtuseness noun — The quality of being blunt or rounded.