obtuse

Adjective
  1. Of an angle;
    Between 90 and 180 degrees (synset 301817190)
  2. (of a leaf shape) rounded at the apex (synset 302176916)
  3. Lacking in insight or discernment (synset 300776051)
    "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"
  4. Slow to learn or understand;
    Lacking intellectual acuity (synset 300442596)
    "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"

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