| unconsolidated | (adjective) loose and unstratified | - |
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| undamaged | (adjective) not harmed or spoiled; sound | - |
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| undatable | (adjective) not capable of being given a date | - |
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| undated | (adjective) not bearing a date | Synonyms: dateless |
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| undaunted | (adjective) resolutely courageous | - |
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| (adjective) unshaken in purpose | Synonyms: undismayed, unshaken |
| undefendable | (adjective) not defended or capable of being defended | Synonyms: assailable, open, undefended |
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| undependable | (adjective) not worthy of reliance or trust | Synonyms: unreliable |
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| (adjective) liable to be erroneous or misleading | Synonyms: unreliable |
| understandable | (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, intelligible, perceivable |
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| undividable | (adjective) cannot be divided without leaving a remainder | Synonyms: indivisible by |
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| unexpendable | (adjective) not suitable to be expended | - |
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| unimodal | (adjective) having a single mode | - |
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| unintimidated | (adjective) not shrinking from danger | Synonyms: unblinking, unflinching, unshrinking |
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| unpersuadable | (adjective) not susceptible to persuasion | Synonyms: unsuasible |
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| unreadable | (adjective) not easily deciphered | Synonyms: indecipherable, unclear, undecipherable |
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| unsoundable | (adjective) too deep to determine the depth of | - |
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| validated | (adjective) declared or made legally valid | - |
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| validating | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiating, substantiative, validatory, verificatory, verifying |
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| validatory | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiating, substantiative, validating, verificatory, verifying |
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| vendable | (adjective) fit to be offered for sale | Synonyms: marketable, merchantable, sellable, vendible |
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| verdant | (adjective) characterized by abundance of verdure | - |
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| viricidal | (adjective) tending to destroy viruses | Synonyms: virucidal |
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| virucidal | (adjective) tending to destroy viruses | Synonyms: viricidal |
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| voidable | (adjective) capable of being rescinded or voided | Synonyms: rescindable |
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| workaday | (adjective) found in the ordinary course of events | Synonyms: everyday, mundane, quotidian, routine, unremarkable |
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| zygodactyl | (adjective) (of bird feet) having the first and fourth toes directed backward the second and third forward | - |
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