1. [ adjective ] lacking in insight or discernment
Synonyms: purblind

"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

Related terms: undiscerning
2. [ adjective ] of an angle; between 90 and 180 degrees
Related terms: acute
3. [ adjective ] (botany) of a leaf shape; rounded at the apex
Related terms: simple
4. [ adjective ] slow to learn or understand; lacking intellectual acuity
Synonyms: dumb slow dull dim dense

"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"

Related terms: stupid
Similar spelling:   obtusely