Main entry: obtuse
Definition: of an angle; between 90 and 180 degrees
Antonyms: acute
Definition: of an angle; less than 90 degrees
Main entry: obtuse
Definition: (of a leaf shape) rounded at the apex
Antonyms: compound
Definition: composed of more than one part
Antonyms: complex
Definition: complicated in structure; consisting of interconnected parts
Main entry: dim, dense, dull, dumb, obtuse, slow
Definition: slow to learn or understand; lacking intellectual acuity
Usage: 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
Antonyms: smart
Definition: showing mental alertness and calculation and resourcefulness
Main entry: purblind, obtuse
Definition: lacking in insight or discernment
Usage: 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
Antonyms: discerning
Definition: having or revealing keen insight and good judgment