| unapproachability | (noun) a disposition to be unapproachable; unfriendly and inaccessible | - |
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| unattainability | (noun) The fact of being unattainable, of not being able to be reached or acquired. | - |
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| unavailability | (noun) the quality of not being available when needed | - |
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| unavoidability | (noun) the quality of being impossible to avoid or evade | Synonyms: ineluctability |
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| unchangeability | (noun) the quality of being unchangeable; having a marked tendency to remain unchanged | Synonyms: changelessness, unchangeableness, unchangingness |
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| undependability | (noun) the trait of not being dependable or reliable | Synonyms: undependableness, unreliability, unreliableness |
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| understandability | (noun) the quality of comprehensible language or thought | Synonyms: comprehensibility |
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| undesirability | (noun) the quality possessed by something that should be avoided | - |
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| unexchangeability | (noun) the quality of being incapable of exchange or interchange | - |
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| unfeasibility | (noun) the quality of not being doable | Synonyms: infeasibility |
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| uninsurability | (noun) the quality of being uninsurable; the conditions under which an insurance company will refuse to issue insurance to an applicant (based on standards set by the insurance company) | - |
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| unintelligibility | (noun) incomprehensibility as a consequence of being unintelligible | - |
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| (noun) nonsense that is simply incoherent and unintelligible | Synonyms: incoherence, incoherency |
| unmalleability | (noun) a lack of malleability | - |
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| unpalatability | (noun) the property of being unacceptable to the mouth | Synonyms: unpalatableness |
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| (noun) the property of being unacceptable to the mind | Synonyms: unpalatableness |
| unpredictability | (noun) lacking predictability | - |
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| (noun) the trait of being unpredictably irresolute | Synonyms: volatility |
| (noun) the quality of being guided by sudden unpredictable impulses | Synonyms: capriciousness |
| unprofitability | (noun) the quality of affording no gain or no benefit or no profit | Synonyms: unprofitableness |
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| unquestionability | (noun) the quality of being beyond question or dispute or doubt | Synonyms: indisputability, indubitability, unquestionableness |
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| unreliability | (noun) the trait of not being dependable or reliable | Synonyms: undependability, undependableness, unreliableness |
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| unrespectability | (noun) dishonorableness by virtue of lacking respectability or a good reputation | Synonyms: disreputability, disreputableness |
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| unsociability | (noun) an unsociable disposition; avoiding friendship or companionship | Synonyms: unsociableness |
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| unsolvability | (noun) the property (of a problem or difficulty) that makes it impossible to solve | Synonyms: insolubility |
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| unsuitability | (noun) the quality of having the wrong properties for a specific purpose | Synonyms: ineptness, unsuitableness |
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| unsusceptibility | (noun) the state of not being susceptible | Synonyms: immunity |
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| urobilin | (noun) brown bile pigment formed from urobilinogens and found in feces and in small amounts in urine | - |
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| urobilinogen | (noun) a chromogen formed in the intestine from the breakdown of bilirubin; yields urobilins on oxidation; some is excreted in the feces and some is resorbed and excreted in bile or urine | Synonyms: stercobilinogen |
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| usability | (noun) the quality of being able to provide good service | Synonyms: serviceability, serviceableness, usableness, useableness |
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| variability | (noun) the quality of being subject to variation | Synonyms: variableness, variance |
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| (noun) the quality of being uneven and lacking uniformity | Synonyms: unevenness |
| venerability | (noun) the quality of deserving veneration | Synonyms: venerableness |
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| verifiability | (noun) The state or property of being capable of being verified; confirmability. | - |
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| viability | (noun) (of living things) capable of normal growth and development | - |
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| (noun) capable of being done in a practical and useful way | - |
| visibility | (noun) quality or fact or degree of being visible; perceptible by the eye or obvious to the eye | Synonyms: visibleness |
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| (noun) capability of providing a clear unobstructed view | - |
| (noun) degree of exposure to public notice | Synonyms: profile |
| volubility | (noun) the quality of being facile in speech and writing | Synonyms: articulateness, fluency |
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| vulnerability | (noun) susceptibility to injury or attack | - |
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| (noun) the state of being vulnerable or exposed | Synonyms: exposure |