obtuse obtuse /ɑːbˈtuːs/

adjective

1. Slow to learn or understand; lacking intellectual acuity  ( dense , dim , obtuse , dull , dumb , slow )
   slow to learn or understand; lacking intellectual acuity
    So dense he never understands anything I say to him
   so dense he never understands anything I say to him
    Never met anyone quite so dim
   never met anyone quite so dim
    Although dull at classical learning, at mathematics he was uncommonly quick
   although dull at classical learning, at mathematics he was uncommonly quick
    Dumb officials make some really dumb decisions
   dumb officials make some really dumb decisions
    He was either normally stupid or being deliberately obtuse
   he was either normally stupid or being deliberately obtuse
    Worked with the slow students
   worked with the slow students
   
2. Lacking in insight or discernment  ( obtuse , purblind )
   lacking in insight or discernment
    Too obtuse to grasp the implications of his behavior
   too obtuse to grasp the implications of his behavior
    A purblind oligarchy that flatly refused to see that history was condemning it to the dustbin
   a purblind oligarchy that flatly refused to see that history was condemning it to the dustbin
   
3. Of an angle; between 90 and 180 degrees  ( obtuse )
   of an angle; between 90 and 180 degrees
   
4. (of a leaf shape) rounded at the apex  ( obtuse )
   (of a leaf shape) rounded at the apex