| inexpungible | (adjective) not capable of being expunged | Synonyms: inexpungeable |
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| inextensible | (adjective) not extensile | Synonyms: nonextensile, nonprotractile |
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| inexterminable | (adjective) incapable of extermination or extirpation | Synonyms: inextirpable |
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| inextinguishable | (adjective) difficult or impossible to extinguish | - |
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| inextirpable | (adjective) incapable of extermination or extirpation | Synonyms: inexterminable |
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| inextricable | (adjective) not permitting extrication; incapable of being disentangled or untied | - |
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| infallible | (adjective) incapable of failure or error | - |
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| infantile | (adjective) of or relating to infants or infancy | - |
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| (adjective) indicating a lack of maturity | Synonyms: childish |
| (adjective) being or befitting or characteristic of an infant | - |
| infeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, unfeasible, unworkable |
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| infertile | (adjective) incapable of reproducing | Synonyms: sterile, unfertile |
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| inflammable | (adjective) easily ignited | Synonyms: flammable |
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| inflatable | (adjective) designed to be filled with air or gas | - |
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| inflexible | (adjective) resistant to being bent | - |
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| (adjective) incapable of change | - |
| (adjective) not making concessions | Synonyms: sturdy, uncompromising |
| (adjective) incapable of adapting or changing to meet circumstances | Synonyms: rigid, unbending |
| infrangible | (adjective) not capable of being violated or infringed | Synonyms: absolute, inviolable |
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| (adjective) difficult or impossible to break or separate into parts | - |
| inhabitable | (adjective) fit for habitation | Synonyms: habitable |
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| inhale | (verb) draw in (air) | Synonyms: breathe in, inspire |
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| (verb) draw deep into the lungs in by breathing | - |
| inheritable | (adjective) capable of being inherited | Synonyms: heritable |
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| inhospitable | (adjective) unfavorable to life or growth | - |
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| (adjective) not hospitable | - |
| inimitable | (adjective) defying imitation; matchless | - |
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| injectable | (adjective) (used of drugs) capable of being injected | - |
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| inkle | (noun) a linen tape used for trimming as a decoration | - |
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| innersole | (noun) the inner sole of a shoe or boot where the foot rests | Synonyms: insole |
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| innumerable | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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| inoperable | (adjective) not suitable for surgery | - |
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| (adjective) not able to perform its normal function | - |
| insatiable | (adjective) impossible to satisfy | Synonyms: insatiate, unsatiable |
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| inscrutable | (adjective) of an obscure nature | Synonyms: cryptic, cryptical, deep, mysterious, mystifying |
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| insensible | (adjective) incapable of physical sensation | - |
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| (adjective) barely able to be perceived | Synonyms: indiscernible, undetectable |
| (adjective) unresponsive to stimulation | Synonyms: out of it, senseless |
| (adjective) unaware of or indifferent to | Synonyms: unaffected |
| inseparable | (adjective) not capable of being separated | - |
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| insole | (noun) the inner sole of a shoe or boot where the foot rests | Synonyms: innersole |
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| insoluble | (adjective) (of a substance) incapable of being dissolved | Synonyms: indissoluble |
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| (adjective) admitting of no solution or explanation | - |
| (adjective) without hope of solution | - |
| insolvable | (adjective) not easily solved | Synonyms: unresolvable, unsoluble, unsolvable |
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| insufferable | (adjective) unbearably arrogant or conceited | - |
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| (adjective) too extreme to bear | Synonyms: unsufferable |
| insuperable | (adjective) incapable of being surmounted or excelled | Synonyms: unconquerable |
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| (adjective) impossible to surmount | Synonyms: insurmountable |
| insupportable | (adjective) incapable of being justified or explained | Synonyms: indefensible, unjustifiable, unwarrantable, unwarranted |
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| insurable | (adjective) capable of being insured or eligible to be insured | - |
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| insurmountable | (adjective) not capable of being surmounted or overcome | Synonyms: unsurmountable |
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| (adjective) impossible to surmount | Synonyms: insuperable |
| insusceptible | (adjective) not susceptible to | Synonyms: unsusceptible |
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| intangible | (adjective) incapable of being perceived by the senses especially the sense of touch | Synonyms: impalpable |
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| (adjective) (of especially business assets) not having physical substance or intrinsic productive value | - |
| (adjective) lacking substance or reality; incapable of being touched or seen | Synonyms: nonphysical |
| (adjective) hard to pin down or identify | - |
| (noun) assets that are saleable though not material or physical | Synonyms: intangible asset |
| intelligible | (adjective) well articulated or enunciated, and loud enough to be heard distinctly | - |
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| (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, perceivable, understandable |
| interchangeable | (adjective) capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability | Synonyms: exchangeable, similar, standardised, standardized |
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| (adjective) (mathematics, logic) such that the arguments or roles can be interchanged | - |
| interminable | (adjective) tiresomely long; seemingly without end | Synonyms: endless, eternal |
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| intermingle | (verb) combine into one | Synonyms: blend, immingle, intermix |
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| interoperable | (adjective) able to exchange and use information | - |
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| interpretable | (adjective) capable of being understood | Synonyms: explainable |
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| intolerable | (adjective) incapable of being tolerated or endured | Synonyms: unbearable, unendurable |
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| intractable | (adjective) not tractable; difficult to manage or mold | - |
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| introuvable | (adjective) impossible to find | - |
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| inutile | (adjective) not worth using | - |
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| invaluable | (adjective) having incalculable monetary, intellectual, or spiritual worth | Synonyms: priceless |
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| invariable | (adjective) not liable to or capable of change | - |
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| (noun) a quantity that does not vary | Synonyms: constant, constant quantity |
| inveigle | (verb) influence or urge by gentle urging, caressing, or flattering | Synonyms: blarney, cajole, coax, palaver, sweet-talk, wheedle |
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| invertible | (adjective) having an additive or multiplicative inverse | - |
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| invincible | (adjective) incapable of being overcome or subdued | Synonyms: unbeatable, unvanquishable |
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| inviolable | (adjective) incapable of being transgressed or dishonored | - |
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| (adjective) not capable of being violated or infringed | Synonyms: absolute, infrangible |
| (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, secure, strong, unassailable, unattackable |
| (adjective) must be kept sacred | Synonyms: inviolate, sacrosanct |
| invisible | (adjective) impossible or nearly impossible to see; imperceptible by the eye | Synonyms: unseeable |
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| (adjective) not prominent or readily noticeable | Synonyms: inconspicuous |
| invulnerable | (adjective) immune to attack; impregnable | - |
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| irascible | (adjective) characterized by anger | Synonyms: choleric |
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| (adjective) quickly aroused to anger | Synonyms: choleric, hot-tempered, hotheaded, quick-tempered, short-tempered |
| irreclaimable | (adjective) insusceptible of reform | Synonyms: irredeemable, unredeemable, unreformable |
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| irreconcilable | (adjective) impossible to reconcile | Synonyms: unreconcilable |
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| irrecoverable | (adjective) incapable of being recovered or regained | Synonyms: unrecoverable |
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| irredeemable | (adjective) (of paper money) not convertible into coin at the pleasure of the holder | - |
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| (adjective) insusceptible of reform | Synonyms: irreclaimable, unredeemable, unreformable |
| irreducible | (adjective) incapable of being made smaller or simpler | - |
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| irrefutable | (adjective) impossible to deny or disprove | Synonyms: incontrovertible, positive |
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| irremediable | (adjective) impossible to remedy or correct or redress | - |
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| irremovable | (adjective) incapable of being removed or away or dismiss | - |
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| irreparable | (adjective) impossible to repair, rectify, or amend | - |
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| irreplaceable | (adjective) impossible to replace | Synonyms: unreplaceable |
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| irrepressible | (adjective) impossible to repress or control | Synonyms: uncontrollable |
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| irreproachable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, unimpeachable |
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| irreproducible | (adjective) impossible to reproduce or duplicate | Synonyms: unreproducible |
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| irresistible | (adjective) impossible to resist; overpowering | Synonyms: resistless |
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| (adjective) overpoweringly attractive | - |
| irresponsible | (adjective) showing lack of care for consequences | - |
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| irretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: unretrievable |
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| irreversible | (adjective) incapable of being reversed | - |
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| irrevocable | (adjective) incapable of being retracted or revoked | Synonyms: irrevokable |
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| irrevokable | (adjective) incapable of being retracted or revoked | Synonyms: irrevocable |
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| irritable | (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
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| (adjective) capable of responding to stimuli | Synonyms: excitable |
| (adjective) abnormally sensitive to a stimulus | - |
| isle | (noun) a small island | Synonyms: islet |
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| isolable | (adjective) capable of being isolated or disjoined | - |
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| itraconazole | (noun) an oral antifungal drug (trade name Sporanox) taken for cases of fungal nail disease | Synonyms: Sporanox |
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| jangle | (noun) a metallic sound | Synonyms: jingle |
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| (verb) make a sound typical of metallic objects | Synonyms: jingle-jangle, jingle |
| jiggle | (noun) a slight irregular shaking motion | Synonyms: joggle |
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| (verb) move to and fro | Synonyms: joggle, wiggle |
| jingle | (noun) a comic verse of irregular measure | Synonyms: doggerel, doggerel verse |
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| (noun) a metallic sound | Synonyms: jangle |
| (verb) make a sound typical of metallic objects | Synonyms: jangle, jingle-jangle |
| joggle | (noun) a slight irregular shaking motion | Synonyms: jiggle |
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| (noun) a fastener that is inserted into holes in two adjacent pieces and holds them together | Synonyms: dowel, dowel pin |
| (verb) fasten or join with a joggle | - |
| (verb) move to and fro | Synonyms: jiggle, wiggle |
| jostle | (noun) the act of jostling (forcing your way by pushing) | Synonyms: jostling |
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| (verb) come into rough contact with while moving | Synonyms: shove |
| (verb) make one's way by jostling, pushing, or shoving | - |
| joule | (noun) a unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second | Synonyms: J, watt second |
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| judicable | (adjective) capable of being judged or decided | - |
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| jugale | (noun) the craniometric point at the union of the frontal and temporal processes of the zygomatic bone | Synonyms: jugal point |
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| juggle | (noun) throwing and catching several objects simultaneously | Synonyms: juggling |
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| (noun) the act of rearranging things to give a misleading impression | Synonyms: juggling |
| (verb) throw, catch, and keep in the air several things simultaneously | - |
| (verb) hold with difficulty and balance insecurely | - |
| (verb) deal with simultaneously | - |
| (verb) manipulate by or as if by moving around components | - |
| (verb) influence by slyness | Synonyms: beguile, hoodwink |
| jumble | (noun) a theory or argument made up of miscellaneous or incongruous ideas | Synonyms: hodgepodge, patchwork |
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| (noun) small flat ring-shaped cake or cookie | Synonyms: jumbal |
| (noun) a confused multitude of things | Synonyms: clutter, fuddle, mare's nest, muddle, smother, welter |
| (verb) bring into random order | Synonyms: scramble, throw together |
| (verb) assemble without order or sense | Synonyms: confuse, mix up |
| (verb) be all mixed up or jumbled together | Synonyms: mingle |
| jungle | (noun) a place where hoboes camp | Synonyms: hobo camp |
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| (noun) an impenetrable equatorial forest | - |
| (noun) a location marked by an intense competition and struggle for survival | - |
| justifiable | (adjective) capable of being justified | - |
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| juvenile | (adjective) of or relating to or characteristic of or appropriate for children or young people | - |
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| (adjective) displaying or suggesting a lack of maturity | Synonyms: adolescent, jejune, puerile |
| (noun) a young person, not fully developed | Synonyms: juvenile person |
| kale | (noun) coarse curly-leafed cabbage | Synonyms: cole, kail |
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| (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: borecole, Brassica oleracea acephala, cole, colewort, kail |
| (noun) informal terms for money | Synonyms: boodle, bread, cabbage, clams, dinero, dough, gelt, lettuce, lolly, loot, lucre, moolah, pelf, scratch, shekels, simoleons, sugar, wampum |
| keratocele | (noun) hernia of the cornea | - |
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| kerfuffle | (noun) a disorderly outburst or tumult | Synonyms: commotion, disruption, disturbance, flutter, hoo-ha, hoo-hah, hurly burly, to-do |
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| kettle | (noun) a metal pot for stewing or boiling; usually has a lid | Synonyms: boiler |
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| (noun) a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it | Synonyms: kettledrum, timpani, tympani, tympanum |
| (noun) (geology) a hollow (typically filled by a lake) that results from the melting of a mass of ice trapped in glacial deposits | Synonyms: kettle hole |
| (noun) the quantity a kettle will hold | Synonyms: kettleful |
| keyhole | (noun) the hole where a key is inserted | - |
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| kibble | (noun) an iron bucket used for hoisting in wells or mining | - |
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| (noun) coarsely ground grain in the form of pellets (as for pet food) | - |
| killable | (adjective) fit to kill, especially for food | - |
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