| impregnability | (noun) having the strength to withstand attack | Synonyms: invulnerability |
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| improbability | (noun) the quality of being improbable | Synonyms: improbableness |
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| inability | (noun) lacking the power to perform | Synonyms: unfitness |
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| (noun) lack of ability (especially mental ability) to do something | - |
| inaccessibility | (noun) the quality of not being accessible | - |
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| inadmissibility | (noun) unacceptability as a consequence of not being admissible | - |
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| inadvisability | (noun) the quality of being ill-advised | - |
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| inalienability | (noun) The condition of being incapable of being alienated, surrendered, or transferred to another. | - |
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| inapplicability | (noun) irrelevance by virtue of being inapplicable to the matter at hand | - |
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| inaudibility | (noun) the quality of not being perceptible by the ear | Synonyms: inaudibleness |
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| incapability | (noun) the quality of not being capable -- physically or intellectually or legally | Synonyms: incapableness |
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| (noun) lack of potential for development | Synonyms: incapableness |
| incivility | (noun) deliberate discourtesy | - |
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| incommutability | (noun) the quality of being not interchangeable | - |
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| incomparability | (noun) The quality of being so much better than another as to be beyond comparison. | - |
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| (noun) The condition of not being able to be compared. | - |
| incompatibility | (noun) the quality of being unable to exist or work in congenial combination | - |
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| (noun) the relation between propositions that cannot both be true at the same time | Synonyms: inconsistency, mutual exclusiveness, repugnance |
| (noun) (immunology) the degree to which the body's immune system will try to reject foreign material (as transfused blood or transplanted tissue) | - |
| incomprehensibility | (noun) the quality of being incomprehensible | - |
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| incompressibility | (noun) the property of being incompressible | - |
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| inconceivability | (noun) the state of being impossible to conceive | Synonyms: inconceivableness |
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| incontrovertibility | (noun) the quality of being undeniable and not worth arguing about | Synonyms: incontrovertibleness, positiveness, positivity |
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| inconvertibility | (noun) the quality of not being exchangeable | - |
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| incorporeality | (noun) the quality of not being physical; not consisting of matter | Synonyms: immateriality |
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| incorruptibility | (noun) the incapability of being corrupted | - |
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| incredibility | (noun) the quality of being incredible | Synonyms: incredibleness |
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| incredulity | (noun) doubt about the truth of something | Synonyms: disbelief, mental rejection, scepticism, skepticism |
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| inculpability | (noun) a state of innocence | Synonyms: blamelessness, guiltlessness, inculpableness |
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| incurability | (noun) incapability of being cured or healed | Synonyms: incurableness |
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| (noun) incapability of being altered in disposition or habits | - |
| indefatigability | (noun) tireless determination | Synonyms: indefatigableness, tirelessness |
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| indefinability | (noun) The quality of not being able to be precisely defined or put into words. | - |
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| indelibility | (noun) The quality of being difficult to delete, remove, wash away, blot out, or efface. | Synonyms: ineffaceability |
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| indescribability | (noun) The quality or state of being impossible, or very difficult to describe. | Synonyms: indescribableness |
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| indestructibility | (noun) the strength to resist destruction | - |
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| indictability | (noun) the state of being liable to impeachment | Synonyms: impeachability |
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| indigestibility | (noun) the property of being difficult to digest | Synonyms: indigestibleness |
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| indiscernibility | (noun) The state or characteristic of being indiscernible; inability to be observed. | - |
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| indispensability | (noun) the quality possessed by something that you cannot possibly do without | Synonyms: indispensableness, vitalness |
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| indisputability | (noun) the quality of being beyond question or dispute or doubt | Synonyms: indubitability, unquestionability, unquestionableness |
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| indistinguishability | (noun) exact sameness | Synonyms: identicalness, identity |
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| individuality | (noun) the quality of being individual | Synonyms: individualism, individuation |
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| (noun) the distinct personality of an individual regarded as a persisting entity | Synonyms: identity, personal identity |
| indivisibility | (noun) (arithmetic) The state of being impossible to divide by a specific integer without leaving a remainder. | - |
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| indomitability | (noun) the property being difficult or impossible to defeat | Synonyms: invincibility |
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| indubitability | (noun) the quality of being beyond question or dispute or doubt | Synonyms: indisputability, unquestionability, unquestionableness |
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| ineffaceability | (noun) The quality of being difficult to delete, remove, wash away, blot out, or efface. | Synonyms: indelibility |
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| ineffectuality | (noun) lacking the power to be effective | Synonyms: ineffectiveness, ineffectualness |
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| ineligibility | (noun) the quality or state of being ineligible | - |
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| ineluctability | (noun) the quality of being impossible to avoid or evade | Synonyms: unavoidability |
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| inequality | (noun) lack of equality | - |
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| inessentiality | (noun) not of basic importance | - |
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| inevitability | (noun) the quality of being unavoidable | Synonyms: inevitableness |
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| inexhaustibility | (noun) The state or condition of being impossible to exhaust; of being unlimited. | - |
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| inexorability | (noun) mercilessness characterized by an unwillingness to relent or let up | Synonyms: inexorableness, relentlessness |
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| infallibility | (noun) the quality of never making an error | - |
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| infeasibility | (noun) the quality of not being doable | Synonyms: unfeasibility |
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| infertility | (noun) the state of being unable to produce offspring; in a woman it is an inability to conceive; in a man it is an inability to impregnate | Synonyms: sterility |
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| infidelity | (noun) the quality of being unfaithful | Synonyms: unfaithfulness |
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| inflammability | (noun) the quality of being easily ignited and burning rapidly | Synonyms: flammability |
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| inflexibility | (noun) the quality of being rigid and rigorously severe | Synonyms: rigidity, rigidness |
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| (noun) a lack of physical flexibility | Synonyms: inflexibleness |
| informality | (noun) a manner that does not take forms and ceremonies seriously | - |
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| (noun) freedom from constraint or embarrassment | Synonyms: ease |
| inhospitality | (noun) unkind and inconsiderate welcome | - |
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| inscrutability | (noun) the quality of being impossible to investigate | - |
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| insensibility | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, callousness, hardness, unfeelingness |
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| (noun) a lack of sensibility | - |
| insolubility | (noun) the quality of being insoluble and difficult to dissolve in liquid | - |
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| (noun) the property (of a problem or difficulty) that makes it impossible to solve | Synonyms: unsolvability |
| instability | (noun) the quality or attribute of being unstable and irresolute | Synonyms: unstableness |
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| (noun) unreliability attributable to being unstable | - |
| (noun) an unstable order | - |
| (noun) a lack of balance or state of disequilibrium | Synonyms: imbalance, unbalance |
| instrumentality | (noun) an artifact (that is instrumental in accomplishing some end) for accomplishing some end | Synonyms: instrumentation, means |
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| (noun) the quality of being instrumental for some purpose | - |
| (noun) a subsidiary organ of government created for a special purpose | - |
| insubstantiality | (noun) lacking substance or reality | - |
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| (noun) lack of solid substance and strength | - |
| insurability | (noun) the quality of being insurable; the conditions under which an insurance company will issue insurance to an applicant (based on standards set by the insurance company) | - |
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| intangibility | (noun) the quality of being intangible and not perceptible by touch | Synonyms: impalpability, intangibleness |
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| integrality | (noun) the state of being total and complete | Synonyms: entireness, entirety, totality |
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| intelligibility | (noun) the quality of language that is comprehensible | - |
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| intentionality | (noun) expressive of intentions | - |
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| interchangeability | (noun) the quality of being capable of exchange or interchange | Synonyms: exchangeability, fungibility, interchangeableness |
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| internality | (noun) preoccupation with what concerns human inner nature (especially ethical or ideological values) | Synonyms: inwardness |
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| internationality | (noun) quality of being international in scope | Synonyms: internationalism |
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| interoperability | (noun) (computer science) the ability to exchange and use information (usually in a large heterogeneous network made up of several local area networks) | - |
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| intractability | (noun) the trait of being hard to influence or control | Synonyms: intractableness |
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| inutility | (noun) the quality of having no practical use | Synonyms: unusefulness, uselessness |
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| 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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| 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 |
| 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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| 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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| legality | (noun) lawfulness by virtue of conformity to a legal statute | - |
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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 |
| lethality | (noun) the quality of being deadly | Synonyms: deadliness |
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| 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 |