obtuse

adjectives

of an angle; between 90 and 180 degrees
antonym
(of a leaf shape) rounded at the apex
is derived from
is similar to
(botany) of leaf shapes; of leaves having no divisions or subdivisions
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
is derived from
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"
is derived from