Antonyms of adj obtuse

4 senses of obtuse

Sense 1
obtuse (vs. acute) -- (of an angle; between 90 and 180 degrees)

acute (vs. obtuse) -- (of an angle; less than 90 degrees)

Sense 2
obtuse -- ((of a leaf shape) rounded at the apex)

INDIRECT (VIA simple) -> compound -- (composed of more than one part; "compound leaves are composed of several lobes; "compound flower heads")

Sense 3
obtuse, purblind -- (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)

INDIRECT (VIA undiscerning) -> discerning -- (having or revealing keen insight and good judgment; "a discerning critic"; "a discerning reader")

Sense 4
dense, dim, dull, dumb, obtuse, slow -- (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")

INDIRECT (VIA stupid) -> smart -- (showing mental alertness and calculation and resourcefulness)

Similarity of adj obtuse

4 senses of obtuse

Sense 1
obtuse (vs. acute) -- (of an angle; between 90 and 180 degrees)

Sense 2
obtuse -- ((of a leaf shape) rounded at the apex)
       => simple (vs. compound), unsubdivided -- ((botany) of leaf shapes; of leaves having no divisions or subdivisions)

Sense 3
obtuse, purblind -- (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)
       => undiscerning (vs. discerning) -- (lacking discernment)

Sense 4
dense, dim, dull, dumb, obtuse, slow -- (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")
       => stupid (vs. smart) -- (lacking or marked by lack of intellectual acuity)