| unsolvability | (noun) the property (of a problem or difficulty) that makes it impossible to solve | Synonyms: insolubility |
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| unsoundness | (noun) not mentally or physically healthy | - |
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| (noun) a misconception that is fallacious and not true or valid | - |
| (noun) a condition of damage or decay | - |
| unstableness | (noun) the quality or attribute of being unstable and irresolute | Synonyms: instability |
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| unsteadiness | (noun) the quality of not being steady or securely fixed in place | Synonyms: ricketiness |
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| (noun) the quality of being unsteady--varying and unpredictable | - |
| unsuitability | (noun) the quality of having the wrong properties for a specific purpose | Synonyms: ineptness, unsuitableness |
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| unsuitableness | (noun) the quality of having the wrong properties for a specific purpose | Synonyms: ineptness, unsuitability |
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| unsusceptibility | (noun) the state of not being susceptible | Synonyms: immunity |
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| untangling | (noun) the act of releasing from a snarled or tangled condition | Synonyms: disentanglement, extrication, unsnarling |
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| unthoughtfulness | (noun) the trait of not thinking carefully before acting | Synonyms: thoughtlessness |
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| untidiness | (noun) the trait of being untidy and messy | Synonyms: messiness |
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| (noun) the condition of being untidy | - |
| untier | (noun) a person who unfastens or unwraps or opens | Synonyms: opener, undoer, unfastener |
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| untimeliness | (noun) the quality of occurring at an inconvenient time | Synonyms: inopportuneness |
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| (noun) being at an inappropriate time | Synonyms: unseasonableness |
| untouchable | (noun) belongs to lowest social and ritual class in India | Synonyms: Harijan |
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| untroublesomeness | (noun) The property of not giving trouble or anxiety. | - |
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| untrustiness | (noun) the trait of not deserving trust or confidence | Synonyms: untrustworthiness |
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| untrustworthiness | (noun) the trait of not deserving trust or confidence | Synonyms: untrustiness |
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| untruth | (noun) a false statement | Synonyms: falsehood, falsity |
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| untruthfulness | (noun) the quality of being untruthful | - |
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| untying | (noun) loosening the ties that fasten something | Synonyms: undoing, unfastening |
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| untypicality | (noun) any state that is not typical | Synonyms: atypicality |
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| ununbium | (noun) a radioactive transuranic element, with atomic number 112 | Synonyms: atomic number 112, element 112, Uub |
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| ununhexium | (noun) a radioactive transuranic element, with atomic number 116 | Synonyms: atomic number 116, element 116, Uuh |
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| ununpentium | (noun) a radioactive transuranic element, with atomic number 115 | Synonyms: atomic number 115, element 115, Uup |
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| ununquadium | (noun) a radioactive transuranic element, with atomic number 114 | Synonyms: atomic number 114, element 114, Uuq |
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| ununtrium | (noun) a radioactive transuranic element, with atomic number 113 | Synonyms: atomic number 113, element 113, Uut |
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| unusefulness | (noun) the quality of having no practical use | Synonyms: inutility, uselessness |
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| unusualness | (noun) uncommonness by virtue of being unusual | - |
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| unvariedness | (noun) characterized by an absence of variation | - |
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| unveiling | (noun) the act of beginning something new | Synonyms: debut, entry, first appearance, introduction, launching |
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| (noun) putting on display for the first time | - |
| unwariness | (noun) the trait of not being cautious and watchful | - |
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| unwellness | (noun) impairment of normal physiological function affecting part or all of an organism | Synonyms: illness, malady, sickness |
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| unwholesomeness | (noun) the quality of being unhealthful and generally bad for you | Synonyms: morbidity, morbidness |
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| unwieldiness | (noun) trouble in carrying or managing caused by bulk or shape | Synonyms: awkwardness, cumbersomeness |
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| (noun) the quality of being difficult to direct or control by reason of complexity | - |
| unwillingness | (noun) the trait of being unwilling | Synonyms: involuntariness |
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| unwiseness | (noun) the trait of acting stupidly or rashly | Synonyms: folly, foolishness |
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| unworthiness | (noun) the quality or state of lacking merit or value | - |
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| (noun) the quality of being not particularly suitable or befitting | Synonyms: inappropriateness |
| unyieldingness | (noun) resoluteness by virtue of being unyielding and inflexible | Synonyms: adamance, obduracy |
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