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"
Someone who is obtuse has difficulty understanding things, or makes no effort to understand them. I've really been very obtuse and stupid + obtuseness ob·tuse·ness Naivety bordering on obtuseness helped sustain his faith
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
tip broadly rounded so that inner angle of tip greater than 90º (based on Eggli)
obtuseness
Pronunciation
Etymology
[ äb-'tüs, &b-, -' ] (adjective.) 15th century. Middle English, from Latin obtusus blunt, dull, from past participle of obtundere to beat against, blunt, from ob- against + tundere to beat; more at OB-, CONTUSION.