obtuse
adjective
1. of an angle; between 90 and 180 degrees
2. (of a leaf shape) rounded at the apex
Similar word(s): simple, unsubdivided
3. lacking in insight or discernment
- too obtuse to grasp the implications of his behavior
Similar word(s): undiscerning, purblind
4. slow to learn or understand; lacking intellectual acuity
- he was either normally stupid or being deliberately obtuse