| unbalance | (noun) a lack of balance or state of disequilibrium | Synonyms: imbalance, instability |
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| (noun) a state of mental disturbance and disorientation | Synonyms: derangement, mental unsoundness |
| unbecomingness | (noun) the quality of being unbecoming | - |
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| (noun) The state of not being flattering, attractive or appropriate. | - |
| unbelief | (noun) a rejection of belief | Synonyms: disbelief |
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| unboundedness | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infiniteness, infinitude, limitlessness |
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| unbreakableness | (noun) a consistency of something that does not break under pressure | - |
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