| unbuckle | (verb) undo the buckle of | - |
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| unburden | (verb) take the burden off; remove the burden from | Synonyms: disburden |
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| (verb) free or relieve (someone) of a burden | - |
| unburdened | (adjective) not burdened with difficulties or responsibilities | - |
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| (adjective) not encumbered with a physical burden or load | Synonyms: burdenless |
| unburied | (adjective) not buried | - |
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| unburnished | (adjective) of metals e.g.; not made shiny and smooth by friction | - |
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| unbutton | (verb) undo the buttons of | - |
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| unbuttoned | (adjective) not buttoned | Synonyms: unfastened |
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| (adjective) not under constraint in action or expression | Synonyms: unlaced |