| invariability | (noun) the quality of being resistant to variation | Synonyms: invariableness, invariance |
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| (noun) a quality of uniformity and lack of variation | Synonyms: evenness |
| invincibility | (noun) the property being difficult or impossible to defeat | Synonyms: indomitability |
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| invisibility | (noun) the quality of not being perceivable by the eye | Synonyms: invisibleness |
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| invulnerability | (noun) the property of being invulnerable; the property of being incapable of being hurt (physically or emotionally) | - |
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| (noun) having the strength to withstand attack | Synonyms: impregnability |
| irascibility | (noun) a feeling of resentful anger | Synonyms: quick temper, short temper, spleen |
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| irrationality | (noun) the state of being irrational; lacking powers of understanding | Synonyms: unreason |
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| irreality | (noun) the state of being insubstantial or imaginary; not existing objectively or in fact | Synonyms: unreality |
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| irregularity | (noun) behavior that breaches the rule or etiquette or custom or morality | Synonyms: abnormality |
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| (noun) not characterized by a fixed principle or rate; at irregular intervals | Synonyms: unregularity |
| (noun) an irregular asymmetry in shape; an irregular spatial pattern | Synonyms: geometrical irregularity |
| (noun) irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis | Synonyms: constipation |
| irremovability | (noun) the quality or state of not being removable. | - |
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| irrepressibility | (noun) irrepressible liveliness and good spirit | Synonyms: buoyancy |
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| irreproducibility | (noun) the quality of being unreproducible | - |
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| irresistibility | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibleness |
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| irresponsibility | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibleness |
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| irreversibility | (noun) the quality of being irreversible (once done it cannot be changed) | - |
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| irrevocability | (noun) The state or condition of being impossible to retract or reverse; finality. | - |
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| irritability | (noun) a disposition to exhibit uncontrolled anger | Synonyms: biliousness, peevishness, pettishness, snappishness, surliness, temper |
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| (noun) excessive sensitivity of an organ or body part | Synonyms: excitability |
| (noun) an irritable petulant feeling | Synonyms: choler, crossness, fretfulness, fussiness, peevishness, petulance |
| jejunity | (noun) the quality of being vapid and unsophisticated | Synonyms: jejuneness, tameness, vapidity, vapidness |
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| (noun) quality of inadequate nutritive value | Synonyms: jejuneness |
| jocosity | (noun) the trait of merry joking | Synonyms: humorousness, jocoseness, merriness |
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| (noun) fun characterized by humor | Synonyms: jocularity |
| jocularity | (noun) activity characterized by good humor | Synonyms: jest, joke |
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| (noun) fun characterized by humor | Synonyms: jocosity |
| (noun) a feeling of facetious merriment | Synonyms: jocundity |
| jocundity | (noun) a feeling of facetious merriment | Synonyms: jocularity |
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| jollity | (noun) feeling jolly and jovial and full of good humor | Synonyms: jolliness, joviality |
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| joviality | (noun) a jovial nature | Synonyms: conviviality |
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| (noun) feeling jolly and jovial and full of good humor | Synonyms: jolliness, jollity |
| juvenility | (noun) the freshness and vitality characteristic of a young person | Synonyms: youth, youthfulness |
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| (noun) lacking and evidencing lack of experience of life | Synonyms: callowness, jejuneness |
| knowledgeability | (noun) wisdom as evidenced by the possession of knowledge | Synonyms: initiation, knowledgeableness |
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| laity | (noun) in Christianity, members of a religious community that do not have the priestly responsibilities of ordained clergy | Synonyms: temporalty |
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| laterality | (noun) superior development of one side of the body | Synonyms: dominance |
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| (noun) the property of using one hand more than the other | Synonyms: handedness |
| (noun) localization of function on either the right or left sides of the brain | Synonyms: lateralisation, lateralization |
| laudability | (noun) the quality of being worthy of praise | Synonyms: laudableness, praiseworthiness |
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| laxity | (noun) the quality of being lax and neglectful | Synonyms: laxness, remissness, slackness |
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| (noun) the condition of being physiologically lax | Synonyms: laxness |
| legality | (noun) lawfulness by virtue of conformity to a legal statute | - |
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| legerity | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: agility, lightness, lightsomeness, nimbleness |
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| legibility | (noun) a quality of writing (print or handwriting) that can be easily read | Synonyms: readability |
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| (noun) distinctness that makes perception easy | Synonyms: discernability |
| lenity | (noun) mercifulness as a consequence of being lenient or tolerant | Synonyms: lenience, leniency, mildness |
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| lethality | (noun) the quality of being deadly | Synonyms: deadliness |
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| levity | (noun) a manner lacking seriousness | - |
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| (noun) feeling an inappropriate lack of seriousness | - |
| liability | (noun) the quality of being something that holds you back | - |
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| (noun) an obligation to pay money to another party | Synonyms: financial obligation, indebtedness |
| (noun) the state of being legally obliged and responsible | - |
| liberality | (noun) the trait of being generous in behavior and temperament | Synonyms: liberalness |
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| (noun) an inclination to favor progress and individual freedom | Synonyms: liberalness |
| limpidity | (noun) passing light without diffusion or distortion | Synonyms: pellucidity, pellucidness |
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| (noun) free from obscurity and easy to understand; the comprehensibility of clear expression | Synonyms: clarity, clearness, lucidity, lucidness, pellucidity |
| linearity | (noun) the property of having one dimension | Synonyms: one-dimensionality |
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| liquidity | (noun) the property of flowing easily | Synonyms: fluidity, fluidness, liquidness, runniness |
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| (noun) being in cash or easily convertible to cash; debt paying ability | - |
| (noun) the state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility | Synonyms: liquid, liquid state, liquidness |
| lividity | (noun) unnatural lack of color in the skin (as from bruising or sickness or emotional distress) | Synonyms: achromasia, lividness, luridness, paleness, pallidness, pallor, wanness |
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| (noun) a state of fury so great the face becomes discolored | - |
| lobularity | (noun) the property of having lobules | - |
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| locality | (noun) a surrounding or nearby region | Synonyms: neck of the woods, neighborhood, neighbourhood, vicinity |
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| logicality | (noun) correct and valid reasoning | Synonyms: logicalness |
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| longanimity | (noun) good-natured tolerance of delay or incompetence | Synonyms: forbearance, patience |
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| longevity | (noun) duration of service | Synonyms: length of service |
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| (noun) the property of being long-lived | Synonyms: seniority |
| loquacity | (noun) the quality of being wordy and talkative | Synonyms: garrulity, garrulousness, loquaciousness, talkativeness |
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| lubricity | (noun) feeling morbid sexual desire or a propensity to lewdness | Synonyms: carnality, lasciviousness, prurience, pruriency |
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| lucidity | (noun) free from obscurity and easy to understand; the comprehensibility of clear expression | Synonyms: clarity, clearness, limpidity, lucidness, pellucidity |
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| (noun) a lucid state of mind; not confused | - |
| luminosity | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminance, luminousness |
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| lyricality | (noun) the property of being suitable for singing | Synonyms: lyricism, songfulness |
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| lysogenicity | (noun) the condition of a host bacterium that has incorporated a phage into its own genetic material | Synonyms: lysogeny |
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| magnanimity | (noun) liberality in bestowing gifts; extremely liberal and generous of spirit | Synonyms: largess, largesse, munificence, openhandedness |
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| majority | (noun) the property resulting from being or relating to the greater in number of two parts; the main part | Synonyms: bulk |
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| (noun) (elections) more than half of the votes | Synonyms: absolute majority |
| (noun) the age at which persons are considered competent to manage their own affairs | Synonyms: legal age |
| malignity | (noun) quality of being disposed to evil; intense ill will | Synonyms: malignance, malignancy |
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| (noun) wishing evil to others | Synonyms: malevolence |
| malleability | (noun) the property of being physically malleable; the property of something that can be worked or hammered or shaped without breaking | Synonyms: plasticity |
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| manageability | (noun) the capability of being managed or controlled | Synonyms: manageableness |
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| maneuverability | (noun) the quality of being maneuverable | Synonyms: manoeuvrability |
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| manipulability | (noun) the quality of being controllable by skilled movements of the hands | - |
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| manoeuvrability | (noun) the quality of being maneuverable | Synonyms: maneuverability |
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| marginality | (noun) the property of being marginal or on the fringes | - |
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| marriageability | (noun) eligibility for marriage | - |
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| masculinity | (noun) the properties characteristic of the male sex | Synonyms: maleness |
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| (noun) the trait of behaving in ways considered typical for men | - |
| materiality | (noun) the quality of being physical; consisting of matter | Synonyms: corporality, corporeality, physicalness |
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| (noun) relevance requiring careful consideration | - |
| maternity | (noun) the quality of having or showing the tenderness and warmth and affection of or befitting a mother | Synonyms: maternal quality, maternalism, motherliness |
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| (noun) the kinship relation between an offspring and the mother | Synonyms: motherhood |
| (noun) the state of being pregnant; the period from conception to birth when a woman carries a developing fetus in her uterus | Synonyms: gestation, pregnancy |
| matrilineality | (noun) a system in which a person's descent is traced through their mother and her maternal ancestors. | - |
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| maturity | (noun) state of being mature; full development | Synonyms: matureness |
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| (noun) the period of time in your life after your physical growth has stopped and you are fully developed | Synonyms: adulthood |
| (noun) the date on which an obligation must be repaid | Synonyms: due date, maturity date |
| measurability | (noun) the quality of being measurable | Synonyms: quantifiability |
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| medievality | (noun) The quality of being of or relating to the Middle Ages, perhaps circa 500 to circa 1500 CE. | - |
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| mediocrity | (noun) ordinariness as a consequence of being average and not outstanding | Synonyms: averageness |
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| (noun) a person of second-rate ability or value | Synonyms: second-rater |
| meltability | (noun) Capability of being reduced from a solid to a liquid state usually by heat. | - |
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| memorability | (noun) the quality of being worth remembering | - |
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| mendacity | (noun) the tendency to be untruthful | - |
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| mendicity | (noun) the state of being a beggar or mendicant | Synonyms: beggary, mendicancy |
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| mentality | (noun) mental ability | Synonyms: brain, brainpower, learning ability, mental capacity, wit |
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| (noun) a habitual or characteristic mental attitude that determines how you will interpret and respond to situations | Synonyms: mind-set, mindset, outlook |
| merchantability | (noun) the state of being fit for market; ready to be bought or sold | - |
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| metallicity | (noun) The state of possessing a similar aural resonance to metal. | - |
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| metastability | (noun) the quality of a physical system that persists in its existing equilibrium when undisturbed (or only slightly disturbed) but able to pass to a more stable equilibrium when sufficiently disturbed | - |
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| meticulosity | (noun) strict attention to minute details | Synonyms: meticulousness, punctiliousness, scrupulousness |
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| minimality | (noun) The state of being the smallest possible amount, quantity, or degree. | - |
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| minority | (noun) being or relating to the smaller in number of two parts | - |
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| (noun) a group of people who differ racially or politically from a larger group of which it is a part | - |
| (noun) any age prior to the legal age | Synonyms: nonage |
| mobility | (noun) the quality of moving freely | - |
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| modality | (noun) a method of therapy that involves physical or electrical therapeutic treatment | - |
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| (noun) a particular sense | Synonyms: sense modality, sensory system |
| (noun) a classification of propositions on the basis of whether they claim necessity or possibility or impossibility | Synonyms: mode |
| (noun) verb inflections that express how the action or state is conceived by the speaker | Synonyms: mode, mood |
| modernity | (noun) the quality of being current or of the present | Synonyms: contemporaneity, contemporaneousness, modernism, modernness |
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| molality | (noun) concentration measured by the number of moles of solute per kilogram of solvent | Synonyms: molal concentration |
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| molarity | (noun) concentration measured by the number of moles of solute per liter of solution | Synonyms: M, molar concentration |
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| monstrosity | (noun) something hideous or frightful | - |
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| (noun) a person or animal that is markedly unusual or deformed | Synonyms: freak, lusus naturae, monster |
| morality | (noun) concern with the distinction between good and evil or right and wrong; right or good conduct | - |
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| (noun) motivation based on ideas of right and wrong | Synonyms: ethical motive, ethics, morals |
| morbidity | (noun) the quality of being unhealthful and generally bad for you | Synonyms: morbidness, unwholesomeness |
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| (noun) an abnormally gloomy or unhealthy state of mind | Synonyms: morbidness |
| (noun) the relative incidence of a particular disease | - |
| mordacity | (noun) a disposition to biting | - |
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| moronity | (noun) mild mental retardation | Synonyms: mental deficiency |
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| mortality | (noun) the quality or state of being mortal | - |
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| (noun) the ratio of deaths in an area to the population of that area; expressed per 1000 per year | Synonyms: death rate, deathrate, fatality rate, mortality rate |
| motility | (noun) a change of position that does not entail a change of location | Synonyms: motion, move, movement |
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| (noun) ability to move spontaneously and independently | - |
| motivity | (noun) the power or ability to move | Synonyms: locomotion, motive power |
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| movability | (noun) the quality of being movable; capable of being moved or rearranged | Synonyms: movableness |
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| muliebrity | (noun) the trait of behaving in ways considered typical for women | Synonyms: femininity |
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| (noun) the state of being an adult woman | Synonyms: womanhood |
| multicollinearity | (noun) a case of multiple regression in which the predictor variables are themselves highly correlated | - |
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| multidimensionality | (noun) The property of having many aspects or facets. | - |
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| multifunctionality | (noun) The condition of having multiple functions. | - |
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| multiplicity | (noun) a large number | Synonyms: numerosity, numerousness |
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| (noun) the property of being multiple | - |
| multiversity | (noun) a university system having several separate campuses and colleges and research centers | - |
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