Adjective
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slow to learn or understand
lacking intellectual acuity
"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"- Thackeray
"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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lacking in insight or discernment
"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"- Jasper Griffin
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(of a leaf shape) rounded at the apex
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of an angle
between 90 and 180 degrees