Obtuse

adj. slow, foolish, stupid; blunt; of an angle between 90 and 180 degrees (Geometry); having blunt-tipped leaves (Botany)

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Adjective
1. of an angle; between 90 and 180 degrees
(antonym) acute
2. of a leaf shape; rounded at the apex
(similar) simple, unsubdivided
3. 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
(synonym) purblind
(similar) undiscerning
4. 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"
(synonym) dense, dim, dull, dumb, slow
(similar) stupid

adj. obtuse, thickheaded, thick; hidebound, opaque

příd.jm. hloupý; omezený