| oblanceolate | (adjective) (of a leaf shape) having a broad rounded apex and a tapering base | - |
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| oblate | (adjective) having the equatorial diameter greater than the polar diameter; being flattened at the poles | Synonyms: pumpkin-shaped |
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| obligate | (adjective) restricted to a particular condition of life | - |
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| obligated | (adjective) caused by law or conscience to follow a certain course | - |
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| obligational | (adjective) relating or constituting or qualified to create a legal or financial obligation | - |
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| obligatory | (adjective) morally or legally constraining or binding | - |
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| (adjective) required by obligation or compulsion or convention | - |
| obliged | (adjective) under a moral obligation to do something | Synonyms: duty-bound |
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| obliging | (adjective) showing a cheerful willingness to do favors for others | Synonyms: complaisant |
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| oblique | (adjective) slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled | - |
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| (adjective) indirect in departing from the accepted or proper way; misleading | Synonyms: devious |
| obliterable | (adjective) able to be obliterated completely | Synonyms: removable |
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| obliterate | (adjective) reduced to nothingness | Synonyms: blotted out, obliterated |
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| obliterated | (adjective) reduced to nothingness | Synonyms: blotted out, obliterate |
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| oblivious | (adjective) failing to keep in mind | Synonyms: forgetful |
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| (adjective) (followed by `to' or `of') lacking conscious awareness of | Synonyms: unmindful |
| oblong | (adjective) deviating from a square or circle or sphere by being elongated in one direction | - |
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| (adjective) (of a leaf shape) having a somewhat elongated form with approximately parallel sides | - |