| acuity | (noun) a quick and penetrating intelligence | Synonyms: acuteness, keenness, sharpness |
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| (noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) | Synonyms: sharp-sightedness, visual acuity |
| ambiguity | (noun) unclearness by virtue of having more than one meaning | Synonyms: equivocalness |
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| (noun) an expression whose meaning cannot be determined from its context | - |
| annuity | (noun) income from capital investment paid in a series of regular payments | Synonyms: rente |
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| antiquity | (noun) an artifact surviving from the past | - |
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| (noun) extreme oldness | Synonyms: ancientness |
| (noun) the historic period preceding the Middle Ages in Europe | - |
| assiduity | (noun) great and constant diligence and attention | Synonyms: assiduousness, concentration |
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| congruity | (noun) the quality of agreeing; being suitable and appropriate | Synonyms: congruence, congruousness |
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| contiguity | (noun) the attribute of being so near as to be touching | Synonyms: adjacency, contiguousness |
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| continuity | (noun) the property of a continuous and connected period of time | Synonyms: persistence |
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| (noun) a detailed script used in making a film in order to avoid discontinuities from shot to shot | - |
| (noun) uninterrupted connection or union | - |
| discontinuity | (noun) lack of connection or continuity | - |
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| equity | (noun) conformity with rules or standards | Synonyms: fairness |
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| (noun) the ownership interest of shareholders in a corporation | - |
| (noun) the difference between the market value of a property and the claims held against it | - |
| exiguity | (noun) the quality of being meager | Synonyms: leanness, meagerness, meagreness, poorness, scantiness, scantness |
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| fatuity | (noun) a ludicrous folly | Synonyms: absurdity, fatuousness, silliness |
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| fortuity | (noun) anything that happens suddenly or by chance without an apparent cause | Synonyms: accident, chance event, stroke |
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| fruity | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| (adjective) tasting or smelling richly of or as of fruit | - |
| gratuity | (noun) a relatively small amount of money given for services rendered (as by a waiter) | Synonyms: backsheesh, baksheesh, bakshis, bakshish, pourboire, tip |
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| (noun) an award (as for meritorious service) given without claim or obligation | - |
| incongruity | (noun) the quality of disagreeing; being unsuitable and inappropriate | Synonyms: incongruousness |
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| inequity | (noun) injustice by virtue of not conforming with rules or standards | Synonyms: unfairness |
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| ingenuity | (noun) the property of being ingenious | Synonyms: cleverness, ingeniousness |
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| (noun) the power of creative imagination | Synonyms: cleverness, ingeniousness, inventiveness |
| iniquity | (noun) morally objectionable behavior | Synonyms: evil, immorality, wickedness |
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| (noun) an unjust act | Synonyms: injustice, shabbiness, unfairness |
| obliquity | (noun) the quality of being deceptive | Synonyms: deceptiveness |
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| (noun) the presentation during labor of the head of the fetus at an abnormal angle | Synonyms: asynclitism |
| perpetuity | (noun) the property of being perpetual (seemingly ceaseless) | Synonyms: sempiternity |
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| perspicuity | (noun) clarity as a consequence of being perspicuous | Synonyms: perspicuousness, plainness |
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| promiscuity | (noun) indulging in promiscuous (casual and indiscriminate) sexual relations | Synonyms: promiscuousness, sleeping around |
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| propinquity | (noun) the property of being close together | Synonyms: proximity |
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| superfluity | (noun) extreme excess | Synonyms: embarrassment, overplus, plethora |
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| tenuity | (noun) a rarified quality | Synonyms: low density, rarity |
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| (noun) the quality of lacking intensity or substance | Synonyms: feebleness |
| (noun) relatively small dimension through an object as opposed to its length or width | Synonyms: slenderness, thinness |
| ubiquity | (noun) the state of being everywhere at once (or seeming to be everywhere at once) | Synonyms: omnipresence, ubiquitousness |
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| unambiguity | (noun) clarity achieved by the avoidance of ambiguity | Synonyms: unequivocalness |
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| vacuity | (noun) total lack of meaning or ideas | Synonyms: inanity, mindlessness, pointlessness, senselessness |
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| (noun) a region that is devoid of matter | Synonyms: vacuum |
| (noun) the absence of matter | Synonyms: vacuum |