| unoriginality | (noun) the quality of being unoriginal | - |
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| (noun) uncreativeness due to a lack of originality | - |
| 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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| unreality | (noun) the quality possessed by something that is unreal | - |
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| (noun) ineptitude in dealing with reality. | - |
| (noun) the state of being insubstantial or imaginary; not existing objectively or in fact | Synonyms: irreality |
| 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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| untypicality | (noun) any state that is not typical | Synonyms: atypicality |
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| usability | (noun) the quality of being able to provide good service | Synonyms: serviceability, serviceableness, usableness, useableness |
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| utility | (adjective) used of beef; usable but inferior | Synonyms: utility-grade |
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| (adjective) capable of substituting in any of several positions on a team | Synonyms: substitute |
| (noun) the service (electric power or water or transportation) provided by a public utility | - |
| (noun) a facility composed of one or more pieces of equipment connected to or part of a structure and designed to provide a service such as heat or electricity or water or sewage disposal | - |
| (noun) the quality of being of practical use | Synonyms: usefulness |
| (noun) (computer science) a program designed for general support of the processes of a computer | Synonyms: service program, utility program |
| (noun) a company that performs a public service; subject to government regulation | Synonyms: public-service corporation, public utility, public utility company |
| (noun) (economics) a measure that is to be maximized in any situation involving choice | - |
| 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 |
| venality | (noun) prostitution of talents or offices or services for reward | - |
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| 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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| versatility | (noun) having a wide variety of skills | - |
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| verticality | (noun) position at right angles to the horizon | Synonyms: erectness, uprightness, verticalness |
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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 | - |
| virility | (noun) the trait of being manly; having the characteristics of an adult male | Synonyms: manfulness, manliness |
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| (noun) the masculine property of being capable of copulation and procreation | - |
| 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 |
| vitality | (noun) the property of being able to survive and grow | Synonyms: animation |
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| (noun) an energetic style | Synonyms: verve |
| (noun) (biology) a hypothetical force (not physical or chemical) once thought by Henri Bergson to cause the evolution and development of organisms | Synonyms: elan vital, life force, vital force |
| (noun) a healthy capacity for vigorous activity | Synonyms: energy, vim |
| volatility | (noun) being easily excited | Synonyms: excitability, excitableness |
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| (noun) the trait of being unpredictably irresolute | Synonyms: unpredictability |
| (noun) the property of changing readily from a solid or liquid to a vapor | - |
| 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 |
| whimsicality | (noun) the trait of behaving like an imp | Synonyms: impishness, mischievousness, puckishness |
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| (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: arbitrariness, capriciousness, flightiness, whimsey, whimsy |