| obtund | (verb) reduce the edge or violence of | - |
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| obturate | (verb) block passage through | Synonyms: block, close up, impede, jam, obstruct, occlude |
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| obturator | (noun) a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate) | - |
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| obtuse | (adjective) of an angle; between 90 and 180 degrees | - |
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| (adjective) (of a leaf shape) rounded at the apex | - |
| (adjective) slow to learn or understand; lacking intellectual acuity | Synonyms: dense, dim, dull, dumb, slow |
| (adjective) lacking in insight or discernment | Synonyms: purblind |
| obtusely | (adverb) stupidly or insensitively | Synonyms: densely, dumbly |
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| obtuseness | (noun) the quality of lacking a sharp edge or point | - |
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| (noun) the quality of being slow to understand | Synonyms: dullness |