| unbodied | (adjective) having no body | - |
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| (adjective) not having a material body | Synonyms: bodiless, discorporate, disembodied, unembodied |
| unbolt | (verb) undo the bolt of | - |
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| unbolted | (adjective) not firmly fastened or secured | Synonyms: unbarred, unlatched, unlocked, unsecured |
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| unbooked | (adjective) not reserved in advance | - |
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| unbordered | (adjective) having no border | - |
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| unborn | (adjective) not yet brought into existence | - |
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| unbosom | (verb) relieve oneself of troubling information | Synonyms: relieve |
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| unbound | (adjective) not restrained or tied down by bonds | - |
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| (adjective) not secured within a cover | - |
| (adjective) not held in chemical or physical combination | - |
| unbounded | (adjective) seemingly boundless in amount, number, degree, or especially extent | Synonyms: boundless, limitless |
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| unboundedness | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infiniteness, infinitude, limitlessness |
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| unbowed | (adjective) erect in posture | Synonyms: straight, unbent |
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| (adjective) not forced to bow down to a conqueror | - |
| unbox | (verb) remove from a box | - |
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| (verb) to open a new product on a video stream | - |