| 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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| 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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| unbowed | (adjective) erect in posture | Synonyms: straight, unbent |
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| (adjective) not forced to bow down to a conqueror | - |
| uncarbonated | (adjective) not having carbonation | Synonyms: noncarbonated |
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| uncorroborated | (adjective) unsupported by other evidence | Synonyms: unsubstantiated |
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| unelaborate | (adjective) not elaborate; lacking rich or complex detail | Synonyms: inelaborate |
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| unelaborated | (adjective) giving only major points; lacking completeness | Synonyms: sketchy |
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| unembodied | (adjective) not having a material body | Synonyms: bodiless, discorporate, disembodied, unbodied |
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| unneighborly | (adjective) not exhibiting the qualities expected in a friendly neighbor | Synonyms: unneighbourly |
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| unneighbourly | (adjective) not exhibiting the qualities expected in a friendly neighbor | Synonyms: unneighborly |
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| unsymbolic | (adjective) not standing for something else | Synonyms: nonrepresentative |
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| upbound | (adjective) heading in any direction that is conventionally up | - |
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| vagabond | (adjective) continually changing especially as from one abode or occupation to another | Synonyms: aimless, drifting, floating, vagrant |
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| (adjective) wandering aimlessly without ties to a place or community | Synonyms: rootless |
| verbose | (adjective) using or containing too many words | Synonyms: long-winded, tedious, windy, wordy |
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| verboten | (adjective) excluded from use or mention | Synonyms: forbidden, out, prohibited, proscribed, taboo, tabu |
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| waterborne | (adjective) supported by water | - |
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| (adjective) transported by water | - |
| wellborn | (adjective) of good or upper-class lineage | - |
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| westbound | (adjective) moving toward the west | Synonyms: westerly, westward |
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