| inalienable | (adjective) incapable of being repudiated or transferred to another | Synonyms: unalienable |
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| (adjective) not subject to forfeiture | Synonyms: unforfeitable |
| inalterable | (adjective) not capable of being changed or altered | Synonyms: unalterable |
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| inane | (adjective) extremely silly or stupid | Synonyms: asinine, fatuous |
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| inanimate | (adjective) not endowed with life | Synonyms: non-living, nonliving |
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| (adjective) belonging to the class of nouns denoting nonliving things | - |
| (adjective) appearing dead; not breathing or having no perceptible pulse | Synonyms: breathless, pulseless |
| inapplicable | (adjective) not capable of being applied | Synonyms: unsuitable |
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| inapposite | (adjective) of an inappropriate or misapplied nature | Synonyms: out of place |
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| inappreciable | (adjective) too small to make a significant difference | - |
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| inappropriate | (adjective) not suitable for a particular occasion etc | - |
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| (adjective) not in keeping with what is correct or proper | Synonyms: incompatible, out of keeping, unfitting |
| inapt | (adjective) not elegant or graceful in expression | Synonyms: awkward, clumsy, cumbersome, ill-chosen, inept |
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| inarguable | (adjective) against which no argument can be made | Synonyms: unarguable |
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| inarticulate | (adjective) without or deprived of the use of speech or words | Synonyms: unarticulate |
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| inartistic | (adjective) lacking aesthetic sensibility | Synonyms: unartistic |
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| inattentive | (adjective) showing a lack of attention or care | - |
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| (adjective) not showing due care or attention | Synonyms: neglectful |
| inaudible | (adjective) impossible to hear; imperceptible by the ear | Synonyms: unhearable |
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| inaugural | (adjective) occurring at or characteristic of a formal investiture or induction | - |
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| (adjective) serving to set in motion | Synonyms: first, initiative, initiatory, maiden |
| inauspicious | (adjective) not auspicious; boding ill | Synonyms: unfortunate |
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| (adjective) contrary to your interests or welfare | Synonyms: adverse, untoward |
| (adjective) presaging ill fortune | Synonyms: ill, ominous |
| inauthentic | (adjective) false or fake; not what it appears to be | Synonyms: spurious, unauthentic |
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| incarnate | (adjective) invested with a bodily form especially of a human body | - |
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| (adjective) possessing or existing in bodily form | Synonyms: bodied, corporal, corporate, embodied |
| incriminating | (adjective) charging or suggestive of guilt or blame | Synonyms: criminative, criminatory, incriminatory |
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| incriminatory | (adjective) charging or suggestive of guilt or blame | Synonyms: criminative, criminatory, incriminating |
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| indefinable | (adjective) defying expression or description | Synonyms: indescribable, ineffable, unspeakable, untellable, unutterable |
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| (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: undefinable |
| indeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: undeterminable |
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| (adjective) incapable of being definitely ascertained or calculated | - |
| indeterminate | (adjective) not precisely determined or established; not fixed or known in advance | Synonyms: undetermined |
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| (adjective) having a capacity for continuing to grow at the apex | - |
| (adjective) of uncertain or ambiguous nature | - |
| (adjective) not leading to a definite ending or result | - |
| (adjective) (of a quantity) having no definite value, as an equation that cannot be solved | - |
| indignant | (adjective) angered at something unjust or wrong | Synonyms: incensed, outraged, umbrageous |
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| indiscriminate | (adjective) not marked by fine distinctions | - |
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| (adjective) failing to make or recognize distinctions | - |
| indiscriminating | (adjective) not discriminating | Synonyms: undiscriminating |
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| inexpugnable | (adjective) incapable of being overcome, challenged or refuted | Synonyms: impregnable |
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| inexterminable | (adjective) incapable of extermination or extirpation | Synonyms: inextirpable |
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| infernal | (adjective) being of the underworld | - |
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| (adjective) characteristic of or resembling Hell | - |
| (adjective) of or pertaining to or characteristic of a very uncontrolled and intense fire | - |
| (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blasted, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned |
| (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, fiendish, hellish, satanic, unholy |
| inflationary | (adjective) associated with or tending to cause increases in inflation | - |
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| inflectional | (adjective) characterized by inflections indicating grammatical distinctions | - |
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| informational | (adjective) relating to or having the nature of information | - |
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| inguinal | (adjective) of or relating to or near the groin | - |
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| innate | (adjective) not established by conditioning or learning | Synonyms: unconditioned, unlearned |
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| (adjective) being talented through inherited qualities | Synonyms: born, natural |
| (adjective) present at birth but not necessarily hereditary; acquired during fetal development | Synonyms: congenital, inborn |
| innovational | (adjective) being or producing something like nothing done or experienced or created before | Synonyms: groundbreaking, innovative |
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| inordinate | (adjective) beyond normal limits | Synonyms: excessive, undue, unreasonable |
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| inspirational | (adjective) imparting a divine influence on the mind and soul | - |
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| institutional | (adjective) organized as or forming an institution | - |
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| (adjective) relating to or constituting or involving an institution | - |
| (adjective) characteristic or suggestive of an institution especially in being uniform or dull or unimaginative | Synonyms: uninteresting |
| institutionalised | (adjective) officially placed in or committed to a specialized institution | Synonyms: institutionalized |
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| (adjective) given the character of an institution or incorporated into a structured and usually well-established system | Synonyms: institutionalized |
| institutionalized | (adjective) officially placed in or committed to a specialized institution | Synonyms: institutionalised |
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| (adjective) given the character of an institution or incorporated into a structured and usually well-established system | Synonyms: institutionalised |
| instructional | (adjective) of or relating to or used in instruction | - |
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| insubordinate | (adjective) not submissive to authority | - |
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| (adjective) disposed to or engaged in defiance of established authority | Synonyms: resistant, resistive |
| insurrectional | (adjective) of or relating to or given to insurrection | Synonyms: insurrectionary |
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| insurrectionary | (adjective) of or relating to or given to insurrection | Synonyms: insurrectional |
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| intensional | (adjective) used of the set of attributes that distinguish the referents of a given word | - |
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| intentional | (adjective) done or made or performed with purpose and intent | Synonyms: designed, unintentional |
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| (adjective) characterized by conscious design or purpose | Synonyms: deliberate, knowing |
| interactional | (adjective) capable of acting on or influencing each other | Synonyms: interactive |
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| interdenominational | (adjective) occurring between or among or common to different churches or denominations | Synonyms: interchurch |
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| interdisciplinary | (adjective) drawing from or characterized by participation of two or more fields of study | - |
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| interminable | (adjective) tiresomely long; seemingly without end | Synonyms: endless, eternal |
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| internal | (adjective) happening or arising or located within some limits or especially surface | - |
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| (adjective) inside the country | Synonyms: home, interior, national |
| (adjective) occurring within an institution or community | Synonyms: intragroup |
| (adjective) innermost or essential | Synonyms: inner, intimate |
| (adjective) located inward | Synonyms: inner, interior |
| international | (adjective) concerning or belonging to all or at least two or more nations | - |
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| (adjective) from or between other countries | Synonyms: external, outside |
| internationalist | (adjective) influenced by or advocating internationalism | Synonyms: internationalistic |
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| internationalistic | (adjective) influenced by or advocating internationalism | Synonyms: internationalist |
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| interpersonal | (adjective) occurring among or involving several people | - |
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| intestinal | (adjective) of or relating to or inside the intestines | Synonyms: enteral, enteric |
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| intrapulmonary | (adjective) being or occurring within a lung | - |
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| invitational | (adjective) pertaining to or characteristic of an invitation | - |
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| iodinated | (adjective) treated with iodine | Synonyms: iodised, iodized |
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| iodinating | (adjective) combining or causing to combine with iodine | - |
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| irrational | (adjective) not consistent with or using reason | - |
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| (adjective) real but not expressible as the quotient of two integers | - |
| isochronal | (adjective) equal in duration or interval | Synonyms: isochronous |
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| isoclinal | (adjective) having equal magnetic inclinations | Synonyms: isoclinic |
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| journalistic | (adjective) of or relating to or having the characteristics of journalism | - |
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| jurisdictional | (adjective) restricted to the geographic area under a particular jurisdiction | - |
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| kinaesthetic | (adjective) of or relating to kinesthesis | Synonyms: kinesthetic |
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| knackered | (adjective) extremely exhausted | Synonyms: drained |
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| knavish | (adjective) marked by skill in deception | Synonyms: crafty, cunning, dodgy, foxy, guileful, slick, sly, tricksy, tricky, wily |
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| laminal | (adjective) arranged in or consisting of laminae | Synonyms: laminar |
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| laminar | (adjective) arranged in or consisting of laminae | Synonyms: laminal |
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| lanate | (adjective) covered with dense cottony hairs or hairlike filaments | Synonyms: woolly |
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| lancinate | (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, keen, knifelike, lancinating, piercing, stabbing |
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| lancinating | (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, keen, knifelike, lancinate, piercing, stabbing |
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| latinate | (adjective) derived from or imitative of Latin | - |
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| latitudinal | (adjective) of or relating to latitudes north or south | - |
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| latitudinarian | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, undogmatic, undogmatical |
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| libidinal | (adjective) belonging to the libido | - |
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| lienal | (adjective) of or relating to the spleen | Synonyms: splenetic, splenic |
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| longitudinal | (adjective) of or relating to lines of longitude | - |
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| (adjective) running lengthwise | - |
| (adjective) over an extended time | - |
| lunar | (adjective) of or relating to or associated with the moon | - |
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| lunate | (adjective) resembling the new moon in shape | Synonyms: crescent-shaped, crescent, semilunar |
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| lunatic | (adjective) insane and believed to be affected by the phases of the moon | Synonyms: moonstruck |
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| lyonnaise | (adjective) cooked with onions | - |
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| magnanimous | (adjective) generous and understanding and tolerant | Synonyms: big, large |
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| (adjective) noble and generous in spirit | Synonyms: greathearted |
| maintainable | (adjective) capable of being maintained | - |
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| malignant | (adjective) dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor) | - |
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| 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 |
| managerial | (adjective) of or relating to the function or responsibility or activity of management | - |
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| marginal | (adjective) of questionable or minimal quality | Synonyms: borderline |
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| (adjective) just barely adequate or within a lower limit | Synonyms: bare |
| (adjective) at or constituting a border or edge | Synonyms: fringy |
| (adjective) producing at a rate that barely covers production costs | - |
| maternal | (adjective) characteristic of a mother | - |
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| (adjective) relating to or characteristic of or befitting a parent | Synonyms: parental, paternal |
| (adjective) relating to or derived from one's mother | - |
| (adjective) related on the mother's side | Synonyms: enate, enatic |
| maternalistic | (adjective) showing maternal instincts | - |
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| maturational | (adjective) relating to or involved in maturation | - |
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| matutinal | (adjective) pertaining to or occurring in the morning | - |
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| medicinal | (adjective) having the properties of medicine | Synonyms: medicative |
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| mellisonant | (adjective) pleasing to the ear | Synonyms: dulcet, honeyed, mellifluous, sweet |
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| menacing | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, minacious, minatory, ominous, sinister, threatening |
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| mercenary | (adjective) profit oriented | Synonyms: commercial, mercantile, moneymaking |
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| (adjective) serving for wages in a foreign army | Synonyms: free-lance, freelance |
| (adjective) marked by materialism | Synonyms: materialistic, worldly-minded |
| meridional | (adjective) of or relating to a meridian | - |
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| (adjective) located in the south or characteristic of southern people or places | - |
| migrational | (adjective) of or related to migration | - |
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| millenarian | (adjective) relating to or believing in the millennium of peace and happiness | Synonyms: chiliastic |
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