| undoing | (noun) an act that makes a previous act of no effect (as if not done) | - |
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| (noun) loosening the ties that fasten something | Synonyms: unfastening, untying |
| undress | (noun) partial or complete nakedness | - |
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| undulation | (noun) (physics) a movement up and down or back and forth | Synonyms: wave |
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| (noun) wavelike motion; a gentle rising and falling in the manner of waves | - |
| (noun) an undulating curve | Synonyms: wave |
| undutifulness | (noun) impiety characterized by lack of devotion to duty | - |
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| unease | (noun) the trait of seeming ill at ease | Synonyms: disquiet, uneasiness |
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| (noun) physical discomfort (as mild sickness or depression) | Synonyms: malaise, uneasiness |
| uneasiness | (noun) inability to rest or relax or be still | Synonyms: queasiness, restlessness |
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| (noun) the trait of seeming ill at ease | Synonyms: disquiet, unease |
| (noun) embarrassment deriving from the feeling that others are critically aware of you | Synonyms: self-consciousness, uncomfortableness |
| (noun) feelings of anxiety that make you tense and irritable | Synonyms: disquietude, edginess, inquietude |
| (noun) physical discomfort (as mild sickness or depression) | Synonyms: malaise, unease |
| unemotionality | (noun) absence of emotion | Synonyms: emotionlessness |
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| (noun) apathy demonstrated by an absence of emotional reactions | Synonyms: emotionlessness, impassiveness, impassivity, indifference, phlegm, stolidity |
| unemployed | (noun) people who are involuntarily out of work (considered as a group) | Synonyms: unemployed people |
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| unemployment | (noun) the state of being unemployed or not having a job | - |
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| unenlightenment | (noun) a lack of understanding | - |
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| unequivocalness | (noun) clarity achieved by the avoidance of ambiguity | Synonyms: unambiguity |
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| unevenness | (noun) the quality of being uneven and lacking uniformity | Synonyms: variability |
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| (noun) the quality of being unbalanced | - |
| unexchangeability | (noun) the quality of being incapable of exchange or interchange | - |
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| unexpectedness | (noun) extraordinariness by virtue of being unexpected | Synonyms: surprisingness |
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| unfairness | (noun) an unjust act | Synonyms: iniquity, injustice, shabbiness |
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| (noun) injustice by virtue of not conforming with rules or standards | Synonyms: inequity |
| (noun) partiality that is not fair or equitable | - |
| unfaithfulness | (noun) the quality of being unfaithful | Synonyms: infidelity |
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| unfamiliarity | (noun) unusualness as a consequence of not being well known | Synonyms: strangeness |
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| unfastener | (noun) a person who unfastens or unwraps or opens | Synonyms: opener, undoer, untier |
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| unfastening | (noun) loosening the ties that fasten something | Synonyms: undoing, untying |
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| unfavorableness | (noun) the quality of not being encouraging or indicative of success | Synonyms: unfavourableness |
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| unfavourableness | (noun) the quality of not being encouraging or indicative of success | Synonyms: unfavorableness |
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| unfeasibility | (noun) the quality of not being doable | Synonyms: infeasibility |
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| unfeelingness | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, callousness, hardness, insensibility |
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| unfitness | (noun) the quality of not being suitable | - |
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| (noun) lacking the power to perform | Synonyms: inability |
| (noun) poor physical condition; being out of shape or out of condition (as from a life of ease and luxury) | Synonyms: softness |
| unfolding | (noun) a developmental process | Synonyms: flowering |
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| unforgivingness | (noun) The quality of having no allowance for weakness. | - |
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| unfortunate | (noun) a person who suffers misfortune | Synonyms: unfortunate person |
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| unfriendliness | (noun) an unfriendly disposition | - |
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| (noun) dislike experienced as an absence of friendliness | - |
| ungainliness | (noun) the carriage of someone whose movements and posture are extremely ungainly and inelegant | Synonyms: gawkiness |
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| ungodliness | (noun) impiety by virtue of not being a godly person | Synonyms: godlessness |
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| ungracefulness | (noun) an unpleasant lack of grace in carriage or form or movement or expression | Synonyms: gracelessness |
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| ungraciousness | (noun) an offensive lack of good manners | - |
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| ungrammaticality | (noun) The state or quality of not following rules of grammar. | - |
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| ungratefulness | (noun) a lack of gratitude | Synonyms: ingratitude |
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| unguent | (noun) semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation | Synonyms: balm, ointment, salve, unction |
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| unguiculate | (noun) a mammal having nails or claws | Synonyms: unguiculate mammal |
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| unguis | (noun) any rigid body structure composed primarily of keratin | Synonyms: horny structure |
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| ungulate | (noun) any of a number of mammals with hooves that are superficially similar but not necessarily closely related taxonomically | Synonyms: hoofed mammal |
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| unhappiness | (noun) emotions experienced when not in a state of well-being | Synonyms: sadness |
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| (noun) state characterized by emotions ranging from mild discontentment to deep grief | - |
| unhealthfulness | (noun) the quality of promoting poor health | - |
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| unhealthiness | (noun) a state in which you are unable to function normally and without pain | Synonyms: health problem, ill health |
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| unhelpfulness | (noun) an inability to be helpful | - |
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| unholiness | (noun) the quality of being unholy | - |
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| unhurriedness | (noun) a rate demonstrating an absence of haste or hurry | Synonyms: deliberateness, deliberation, slowness |
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| unicorn | (noun) an imaginary creature represented as a white horse with a long horn growing from its forehead | - |
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| unicycle | (noun) a vehicle with a single wheel that is driven by pedals | Synonyms: monocycle |
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| unicyclist | (noun) a person who rides a unicycle | - |
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| unification | (noun) the act of making or becoming a single unit | Synonyms: conjugation, jointure, union, uniting |
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| (noun) an occurrence that involves the production of a union | Synonyms: fusion, merger |
| (noun) the state of being joined or united or linked | Synonyms: union |
| uniform | (noun) clothing of distinctive design worn by members of a particular group as a means of identification | - |
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| uniformity | (noun) the quality of lacking diversity or variation (even to the point of boredom) | Synonyms: uniformness |
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| (noun) a condition in which everything is regular and unvarying | - |
| uniformness | (noun) the quality of lacking diversity or variation (even to the point of boredom) | Synonyms: uniformity |
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| unilateralism | (noun) the doctrine that nations should conduct their foreign affairs individualistically without the advice or involvement of other nations | - |
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| unilateralist | (noun) an advocate of unilateralism | - |
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| unilaterality | (noun) The state or quality of being unilateral; one-sidedness. | - |
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| unimportance | (noun) the quality of not being important or worthy of note | - |
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| (noun) the state of being humble and unimportant | Synonyms: humbleness, lowliness, obscureness |
| uninitiate | (noun) people who have not been introduced to the mysteries of some field or activity | - |
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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 |
| uninterestingness | (noun) inability to capture or hold one's interest | - |
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| union | (noun) the act of making or becoming a single unit | Synonyms: conjugation, jointure, unification, uniting |
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| (noun) the act of pairing a male and female for reproductive purposes | Synonyms: conjugation, coupling, mating, pairing, sexual union |
| (noun) a device on a national flag emblematic of the union of two or more sovereignties (typically in the upper inner corner) | - |
| (noun) the occurrence of a uniting of separate parts | - |
| (noun) an organization of employees formed to bargain with the employer | Synonyms: brotherhood, labor union, trade union, trades union |
| (noun) a political unit formed from previously independent people or organizations | - |
| (noun) a set containing all and only the members of two or more given sets | Synonyms: join, sum |
| (noun) healing process involving the growing together of the edges of a wound or the growing together of broken bones | Synonyms: conglutination |
| (noun) the state of being joined or united or linked | Synonyms: unification |
| (noun) the state of being a married couple voluntarily joined for life (or until divorce) | Synonyms: marriage, matrimony, spousal relationship, wedlock |
| unionisation | (noun) act of forming labor unions | Synonyms: unionization |
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| unionism | (noun) the system or principles and theory of labor unions | Synonyms: trade unionism |
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| unionist | (noun) a worker who belongs to a trade union | Synonyms: trade unionist, union member |
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| unionization | (noun) act of forming labor unions | Synonyms: unionisation |
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| uniqueness | (noun) the quality of being one of a kind | Synonyms: singularity |
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| unison | (noun) (music) two or more sounds or tones at the same pitch or in octaves | - |
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| (noun) occurring together or simultaneously | - |
| (noun) corresponding exactly | - |
| unit | (noun) an assemblage of parts that is regarded as a single entity | Synonyms: whole |
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| (noun) a single undivided whole | - |
| (noun) an organization regarded as part of a larger social group | Synonyms: social unit |
| (noun) a single undivided natural thing occurring in the composition of something else | Synonyms: building block |
| (noun) any division of quantity accepted as a standard of measurement or exchange | Synonyms: unit of measurement |
| (noun) an individual or group or structure or other entity regarded as a structural or functional constituent of a whole | - |
| unitard | (noun) a tight-fitting garment of stretchy material that covers the body from the shoulders to the thighs (and may have long sleeves or legs reaching down to the ankles); worn by ballet dancers and acrobats for practice or performance | Synonyms: body suit, cat suit, leotard |
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| unitariness | (noun) The quality or state of pertaining to a unit, having the quality of oneness. | - |
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| unitarism | (noun) Politics which favors the process of uniting a political entity which consists of smaller regions, either by cancelling the regions completely or by transferring their power to the central government. | - |
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| uniting | (noun) the act of making or becoming a single unit | Synonyms: conjugation, jointure, unification, union |
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| (noun) the combination of two or more commercial companies | Synonyms: amalgamation, merger |
| unitisation | (noun) conversion of an investment trust into a unit investment trust | Synonyms: unitization |
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| (noun) the joint development of a petroleum resource that straddles territory controlled by different companies | Synonyms: unitization |
| (noun) the act of packaging cargo into unit loads | Synonyms: unitization |
| (noun) (psychology) the configuration of smaller units of information into large coordinated units | Synonyms: chunking, unitization |
| unitization | (noun) conversion of an investment trust into a unit investment trust | Synonyms: unitisation |
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| (noun) the joint development of a petroleum resource that straddles territory controlled by different companies | Synonyms: unitisation |
| (noun) the act of packaging cargo into unit loads | Synonyms: unitisation |
| (noun) (psychology) the configuration of smaller units of information into large coordinated units | Synonyms: chunking, unitisation |
| unity | (noun) the quality of being united into one | Synonyms: oneness |
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| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, ace, I, one, single |
| (noun) an undivided or unbroken completeness or totality with nothing wanting | Synonyms: integrity, wholeness |
| univalve | (noun) a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes | Synonyms: gastropod |
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| universal | (noun) coupling that connects two rotating shafts allowing freedom of movement in all directions | Synonyms: universal joint |
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| (noun) a behavioral convention or pattern characteristic of all members of a particular culture or of all human beings | - |
| (noun) (logic) a proposition that asserts something of all members of a class | Synonyms: universal proposition |
| (noun) (linguistics) a grammatical rule (or other linguistic feature) that is found in all languages | Synonyms: linguistic universal |
| universalism | (noun) the theological doctrine that all people will eventually be saved | - |
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| universality | (noun) the quality of being universal; existing everywhere | Synonyms: catholicity |
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| universe | (noun) everything stated or assumed in a given discussion | Synonyms: universe of discourse |
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| (noun) (statistics) the entire aggregation of items from which samples can be drawn | Synonyms: population |
| (noun) everything that exists anywhere | Synonyms: cosmos, creation, existence, macrocosm, world |
| university | (noun) establishment where a seat of higher learning is housed, including administrative and living quarters as well as facilities for research and teaching | - |
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| (noun) the body of faculty and students at a university | - |
| (noun) a large and diverse institution of higher learning created to educate for life and for a profession and to grant degrees | - |
| unjustness | (noun) the practice of being unjust or unfair | Synonyms: injustice |
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| unkemptness | (noun) a lack of order and tidiness; not cared for | Synonyms: sloppiness, slovenliness |
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| unkindness | (noun) lack of sympathy | - |
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| unknowing | (noun) ignorance (especially of orthodox beliefs) | Synonyms: ignorantness, nescience, unknowingness |
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| unknowingness | (noun) unconsciousness resulting from lack of knowledge or attention | Synonyms: unawareness |
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| (noun) ignorance (especially of orthodox beliefs) | Synonyms: ignorantness, nescience, unknowing |
| unknown | (noun) a variable whose values are solutions of an equation | Synonyms: unknown quantity |
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| (noun) an unknown and unexplored region | Synonyms: terra incognita, unknown region |
| (noun) anyone who does not belong in the environment in which they are found | Synonyms: alien, stranger |
| unlawfulness | (noun) the quality of failing to conform to law | - |
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| unlikelihood | (noun) the improbability of a specified outcome | Synonyms: unlikeliness |
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| unlikeliness | (noun) the improbability of a specified outcome | Synonyms: unlikelihood |
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| unlikeness | (noun) dissimilarity evidenced by an absence of likeness | Synonyms: dissimilitude |
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| unloading | (noun) the labor of taking a load of something off of or out of a vehicle or ship or container etc. | - |
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| unmalleability | (noun) a lack of malleability | - |
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| unmanageableness | (noun) the trait of being unmanageable | Synonyms: recalcitrance, recalcitrancy, refractoriness |
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| unmanliness | (noun) the trait of being effeminate (derogatory of a man) | Synonyms: effeminacy, effeminateness, sissiness, softness, womanishness |
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| unmasking | (noun) the exposure of an impostor or a fraud | Synonyms: expose |
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| unmentionable | (noun) a garment worn under other garments | Synonyms: undergarment |
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| unmercifulness | (noun) inhumaneness evidenced by an unwillingness to be kind or forgiving | Synonyms: mercilessness |
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| unmindfulness | (noun) the trait of forgetting or ignoring your responsibilities | Synonyms: heedlessness, inadvertence, inadvertency |
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| unmusicality | (noun) The state or condition of being lacking in musical ability. | - |
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| unnaturalness | (noun) the quality of being unnatural or not based on natural principles | - |
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