| 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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| 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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| 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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| 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 |
| 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 | - |
| isolable | (adjective) capable of being isolated or disjoined | - |
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| judicable | (adjective) capable of being judged or decided | - |
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| 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 |
| justifiable | (adjective) capable of being justified | - |
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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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| knobble | (noun) a small knob | - |
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| knowable | (adjective) capable of being known | Synonyms: cognisable, cognizable, cognoscible |
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| knowledgeable | (adjective) highly educated; having extensive information or understanding | Synonyms: knowing, learned, lettered, well-educated, well-read |
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| (adjective) thoroughly acquainted through study or experience | Synonyms: intimate, versed |
| (adjective) alert and fully informed | Synonyms: knowing |
| lamentable | (adjective) bad; unfortunate | Synonyms: deplorable, distressing, pitiful, sad, sorry |
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| laudable | (adjective) worthy of high praise | Synonyms: applaudable, commendable, praiseworthy |
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| laughable | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, idiotic, ludicrous, nonsensical, preposterous, ridiculous |
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| (adjective) arousing or provoking laughter | Synonyms: amusing, comic, comical, funny, mirthful, risible |
| legible | (adjective) (of handwriting, print, etc.) capable of being read or deciphered | - |
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| lendable | (adjective) available for lending | - |
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| liable | (adjective) at risk of or subject to experiencing something usually unpleasant | Synonyms: apt |
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| (adjective) held legally responsible | - |
| (adjective) (often followed by `to') likely to be affected with | Synonyms: nonimmune, nonresistant, unresistant |
| (adjective) subject to legal action | - |
| likable | (adjective) (of characters in literature or drama) evoking empathic or sympathetic feelings | Synonyms: appealing, likeable, sympathetic |
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| (adjective) easy to like; agreeable | Synonyms: likeable |
| likeable | (adjective) (of characters in literature or drama) evoking empathic or sympathetic feelings | Synonyms: appealing, likable, sympathetic |
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| (adjective) easy to like; agreeable | Synonyms: likable |
| liquefiable | (adjective) capable of being liquefied | Synonyms: liquifiable |
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| liquifiable | (adjective) capable of being liquefied | Synonyms: liquefiable |
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| livable | (adjective) fit or suitable to live in or with | Synonyms: liveable |
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| liveable | (adjective) fit or suitable to live in or with | Synonyms: livable |
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| lovable | (adjective) having characteristics that attract love or affection | Synonyms: loveable |
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| loveable | (adjective) having characteristics that attract love or affection | Synonyms: lovable |
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| maintainable | (adjective) capable of being maintained | - |
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| malleable | (adjective) capable of being shaped or bent or drawn out | Synonyms: ductile, pliable, pliant, tensile, tractile |
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| (adjective) easily influenced | Synonyms: ductile |
| manageable | (adjective) capable of being managed or controlled | - |
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| (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: accomplishable, achievable, doable, realizable |
| mandible | (noun) the jaw in vertebrates that is hinged to open the mouth | Synonyms: jawbone, jowl, lower jaw, lower jawbone, mandibula, mandibular bone, submaxilla |
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| maneuverable | (adjective) capable of maneuvering or changing position | Synonyms: manoeuvrable |
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| manipulable | (adjective) easily managed (controlled or taught or molded) | Synonyms: tractable |
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| manoeuvrable | (adjective) capable of maneuvering or changing position | Synonyms: maneuverable |
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| marble | (noun) a small ball of glass that is used in various games | - |
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| (noun) a sculpture carved from marble | - |
| (noun) a hard crystalline metamorphic rock that takes a high polish; used for sculpture and as building material | - |
| (verb) paint or stain like marble | - |
| marketable | (adjective) capable of being marketed | - |
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| (adjective) being in demand by especially employers | - |
| (adjective) fit to be offered for sale | Synonyms: merchantable, sellable, vendable, vendible |
| marriageable | (adjective) of girls or women who are eligible to marry | Synonyms: nubile |
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| measurable | (adjective) capable of being measured | Synonyms: mensurable |
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| (adjective) of distinguished importance | - |
| meltable | (adjective) capable of melting | Synonyms: disintegrable |
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| memorable | (adjective) worth remembering | - |
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| mensurable | (adjective) capable of being measured | Synonyms: measurable |
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| (adjective) having notes of fixed rhythmic value | Synonyms: measured, mensural |
| merchantable | (adjective) fit to be offered for sale | Synonyms: marketable, sellable, vendable, vendible |
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| meritable | (adjective) deserving reward or praise | Synonyms: meritorious |
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| metastable | (adjective) (of physical systems) continuing in its present state of equilibrium unless sufficiently disturbed to pass to a more stable state of equilibrium | - |
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| miscible | (adjective) (chemistry, physics) capable of being mixed | Synonyms: mixable |
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| miserable | (adjective) of the most contemptible kind | Synonyms: abject, low-down, low, scummy, scurvy |
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| (adjective) of very poor quality or condition | Synonyms: deplorable, execrable, woeful, wretched |
| (adjective) contemptibly small in amount | Synonyms: measly, paltry |
| (adjective) characterized by physical misery | Synonyms: wretched |
| (adjective) deserving or inciting pity | Synonyms: hapless, misfortunate, pathetic, piteous, pitiable, pitiful, poor, wretched |
| (adjective) very unhappy; full of misery | Synonyms: suffering, wretched |
| mistakable | (adjective) so similar as to be easily identified for another thing | Synonyms: confusable |
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| mitigable | (adjective) capable of being alleviated | - |
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| mixable | (adjective) (chemistry, physics) capable of being mixed | Synonyms: miscible |
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| modifiable | (adjective) capable of being modified in form or character or strength (especially by making less extreme) | - |
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| moldable | (adjective) capable of being molded or modeled (especially of earth or clay or other soft material) | Synonyms: fictile, plastic |
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| monosyllable | (noun) a word or utterance of one syllable | Synonyms: monosyllabic word |
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| movable | (adjective) capable of being moved or conveyed from one place to another | Synonyms: moveable, transferable, transferrable, transportable |
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| (adjective) (of personal property as opposed to real estate) can be moved from place to place (especially carried by hand) | - |
| (noun) personal as opposed to real property; any tangible movable property (furniture or domestic animals or a car etc) | Synonyms: chattel, personal chattel |
| moveable | (adjective) capable of being moved or conveyed from one place to another | Synonyms: movable, transferable, transferrable, transportable |
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| mumble | (noun) a soft indistinct utterance | - |
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| (verb) talk indistinctly; usually in a low voice | Synonyms: maunder, mussitate, mutter |
| (verb) grind with the gums; chew without teeth and with great difficulty | Synonyms: gum |
| mutable | (adjective) capable of or tending to change in form or quality or nature | Synonyms: changeable |
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| (adjective) tending to undergo genetic mutation | - |
| (adjective) prone to frequent change; inconstant | - |