| inaccessibility | (noun) the quality of not being accessible | - |
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| inactivity | (noun) being inactive; being less active | - |
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| (noun) a disposition to remain inactive or inert | Synonyms: inactiveness, inertia |
| (noun) the state of being inactive | Synonyms: inaction, inactiveness |
| 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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| inanity | (noun) total lack of meaning or ideas | Synonyms: mindlessness, pointlessness, senselessness, vacuity |
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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 |
| incapacity | (noun) lack of physical or natural qualifications | - |
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| (noun) lack of intellectual power | - |
| 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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| incongruity | (noun) the quality of disagreeing; being unsuitable and inappropriate | Synonyms: incongruousness |
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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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| indefinity | (noun) the quality of being vague and poorly defined | Synonyms: indefiniteness, indeterminacy, indeterminateness, indetermination |
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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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| indemnity | (noun) a sum of money paid in compensation for loss or injury | Synonyms: amends, damages, indemnification, redress, restitution |
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| (noun) legal exemption from liability for damages | - |
| (noun) protection against future loss | Synonyms: insurance |
| 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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| indignity | (noun) an affront to one's dignity or self-esteem | - |
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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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| inelasticity | (noun) the lack of elasticity | - |
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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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| inequity | (noun) injustice by virtue of not conforming with rules or standards | Synonyms: unfairness |
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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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| infelicity | (noun) inappropriate and unpleasing manner or style (especially manner or style of expression) | - |
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| inferiority | (noun) an inferior quality | Synonyms: low quality |
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| (noun) the quality of being a competitive disadvantage | Synonyms: unfavorable position |
| (noun) the state of being inferior | Synonyms: lower rank, lower status |
| 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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| infinity | (noun) time without end | Synonyms: eternity |
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| infirmity | (noun) the state of being weak in health or body (especially from old age) | Synonyms: debility, feebleness, frailness, frailty, valetudinarianism |
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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 |
| ingenuity | (noun) the property of being ingenious | Synonyms: cleverness, ingeniousness |
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| (noun) the power of creative imagination | Synonyms: cleverness, ingeniousness, inventiveness |
| inhomogeneity | (noun) the quality of being inhomogeneous | - |
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| inhospitality | (noun) unkind and inconsiderate welcome | - |
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| inhumanity | (noun) an act of atrocious cruelty | Synonyms: atrocity |
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| (noun) the quality of lacking compassion or consideration for others | Synonyms: inhumaneness |
| iniquity | (noun) morally objectionable behavior | Synonyms: evil, immorality, wickedness |
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| (noun) an unjust act | Synonyms: injustice, shabbiness, unfairness |
| insalubrity | (noun) the quality of being insalubrious and debilitating | Synonyms: insalubriousness |
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| insanity | (noun) relatively permanent disorder of the mind | - |
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| inscrutability | (noun) the quality of being impossible to investigate | - |
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| insecurity | (noun) the anxiety you experience when you feel vulnerable and insecure | - |
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| (noun) the state of being subject to danger or injury | - |
| insensibility | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, callousness, hardness, unfeelingness |
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| (noun) a lack of sensibility | - |
| insensitivity | (noun) the inability to respond to affective changes in your interpersonal environment | Synonyms: insensitiveness |
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| insincerity | (noun) the quality of not being open or truthful; deceitful or hypocritical | Synonyms: falseness, hollowness |
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| insipidity | (noun) lacking any distinctive or interesting taste property | Synonyms: blandness, insipidness |
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| (noun) extreme dullness; lacking spirit or interest | Synonyms: boringness, dreariness, insipidness |
| 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 | - |
| insularity | (noun) the state of being isolated or detached | Synonyms: detachment, insularism, insulation |
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| 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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| integrity | (noun) moral soundness | - |
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| (noun) an undivided or unbroken completeness or totality with nothing wanting | Synonyms: unity, wholeness |
| intelligibility | (noun) the quality of language that is comprehensible | - |
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| intensity | (noun) high level or degree; the property of being intense | Synonyms: intensiveness |
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| (noun) chromatic purity: freedom from dilution with white and hence vivid in hue | Synonyms: chroma, saturation, vividness |
| (noun) the magnitude of sound (usually in a specified direction) | Synonyms: loudness, volume |
| (noun) the amount of energy transmitted (as by acoustic or electromagnetic radiation) | Synonyms: intensity level, strength |
| 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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| intransitivity | (noun) the grammatical relation created by an intransitive verb | Synonyms: intransitiveness |
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| intrepidity | (noun) resolute courageousness | Synonyms: dauntlessness |
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| inutility | (noun) the quality of having no practical use | Synonyms: unusefulness, uselessness |
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| invalidity | (noun) illogicality as a consequence of having a conclusion that does not follow from the premisses | Synonyms: invalidness |
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