| ignoble | (adjective) completely lacking nobility in character or quality or purpose | - |
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| (adjective) not of the nobility | Synonyms: ungentle, untitled |
| illative | (adjective) relating to or having the nature of illation or inference | Synonyms: inferential |
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| (adjective) expressing or preceding an inference | - |
| (adjective) resembling or dependent on or arrived at by inference | Synonyms: inferential |
| illegible | (adjective) (of handwriting, print, etc.) not legible | - |
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| illegitimate | (adjective) of marriages and offspring; not recognized as lawful | - |
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| (adjective) contrary to or forbidden by law | Synonyms: illicit, outlaw, outlawed, unlawful |
| illimitable | (adjective) without limits in extent or size or quantity | Synonyms: limitless, measureless, unmeasured |
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| illiterate | (adjective) not able to read or write | - |
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| (adjective) lacking culture, especially in language and literature | - |
| (adjective) uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field | Synonyms: ignorant |
| illusive | (adjective) based on or having the nature of an illusion | Synonyms: illusory |
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| illustrative | (adjective) clarifying by use of examples | Synonyms: exemplifying |
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| (adjective) serving to demonstrate | Synonyms: demonstrative |
| imaginable | (adjective) capable of being imagined | Synonyms: conceivable |
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| imaginative | (adjective) (used of persons or artifacts) marked by independence and creativity in thought or action | Synonyms: inventive |
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| imbecile | (adjective) having a mental age of three to seven years | Synonyms: idiotic, imbecilic |
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| imbricate | (adjective) used especially of leaves or bracts; overlapping or layered as scales or shingles | Synonyms: imbricated |
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| imitative | (adjective) marked by or given to imitation | - |
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| (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, onomatopoeic, onomatopoeical, onomatopoetic |
| (adjective) not genuine; imitating something superior | Synonyms: counterfeit |
| immaculate | (adjective) completely neat and clean | Synonyms: speckless, spic-and-span, spic, spick-and-span, spick, spotless |
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| (adjective) without fault or error | Synonyms: faultless, impeccable, incorrupted |
| (adjective) free from stain or blemish | Synonyms: undefiled |
| immature | (adjective) not yet mature | - |
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| (adjective) characteristic of a lack of maturity | - |
| (adjective) (used of living things especially persons) in an early period of life or development or growth | Synonyms: young |
| (adjective) (of birds) not yet having developed feathers | Synonyms: unfledged |
| (adjective) not fully developed or mature; not ripe | Synonyms: green, unripe, unripened |
| immeasurable | (adjective) impossible to measure | Synonyms: immensurable, unmeasurable |
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| (adjective) beyond calculation or measure | Synonyms: incomputable, inestimable |
| immediate | (adjective) having no intervening medium | - |
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| (adjective) very close or connected in space or time | Synonyms: contiguous |
| (adjective) performed with little or no delay | Synonyms: prompt, quick, straightaway |
| (adjective) of the present time and place | - |
| (adjective) immediately before or after as in a chain of cause and effect | - |
| immense | (adjective) unusually great in size or amount or degree or especially extent or scope | Synonyms: Brobdingnagian, huge, vast |
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| immensurable | (adjective) impossible to measure | Synonyms: immeasurable, unmeasurable |
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| immiscible | (adjective) (chemistry, physics) incapable of mixing | Synonyms: non-miscible, unmixable |
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| immobile | (adjective) not capable of movement or of being moved | - |
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| (adjective) securely fixed in place | Synonyms: fast, firm |
| immoderate | (adjective) beyond reasonable limits | - |
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| immotile | (adjective) (of spores or microorganisms) not capable of movement | Synonyms: nonmotile |
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| immovable | (adjective) not able or intended to be moved | Synonyms: immoveable, stabile, unmovable |
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| immoveable | (adjective) not able or intended to be moved | Synonyms: immovable, stabile, unmovable |
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| immune | (adjective) relating to the condition of immunity | - |
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| (adjective) secure against | - |
| (adjective) (usually followed by `to') not affected by a given influence | - |
| (adjective) relating to or conferring immunity (to disease or infection) | Synonyms: resistant |
| immunosuppressive | (adjective) of or relating to a substance that lowers the body's normal immune response and induces immunosuppression | - |
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| immutable | (adjective) not subject or susceptible to change or variation in form or quality or nature | Synonyms: changeless |
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| (adjective) constant and unchanging | - |
| impalpable | (adjective) imperceptible to the senses or the mind | - |
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| (adjective) incapable of being perceived by the senses especially the sense of touch | Synonyms: intangible |
| (adjective) not perceptible to the touch | - |
| imparipinnate | (adjective) (a leaf shape) pinnate with a single leaflet at the apex | Synonyms: odd-pinnate |
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| impassable | (adjective) incapable of being passed | Synonyms: unpassable |
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| impassive | (adjective) deliberately impassive in manner | Synonyms: deadpan, expressionless, poker-faced, unexpressive |
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| (adjective) having or revealing little emotion or sensibility; not easily aroused or excited | Synonyms: stolid |
| impeccable | (adjective) without fault or error | Synonyms: faultless, immaculate, incorrupted |
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| (adjective) not capable of sin | - |
| impenetrable | (adjective) not admitting of penetration or passage into or through | - |
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| (adjective) impossible to understand | - |
| (adjective) permitting little if any light to pass through because of denseness of matter | Synonyms: dense, heavy |
| imperative | (adjective) requiring attention or action | - |
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| (adjective) relating to verbs in the imperative mood | - |
| imperceptible | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: unperceivable |
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| imperfectible | (adjective) capable of being made imperfect | - |
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| imperforate | (adjective) not perforated; having no opening | - |
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| imperishable | (adjective) not perishable | - |
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| (adjective) lasting a long time | Synonyms: abiding, enduring |
| impermeable | (adjective) preventing especially liquids to pass or diffuse through | - |
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| impermissible | (adjective) not permitted | - |
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| (adjective) not allowable | - |
| imperturbable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: unflappable |
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| imperviable | (adjective) not admitting of passage or capable of being affected | Synonyms: impervious |
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| implacable | (adjective) incapable of being placated | - |
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| implausible | (adjective) having a quality that provokes disbelief | - |
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| implicative | (adjective) tending to suggest or imply | Synonyms: suggestive |
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| implike | (adjective) naughtily or annoyingly playful | Synonyms: arch, impish, mischievous, pixilated, prankish, puckish, wicked |
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| impolite | (adjective) not polite | - |
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| imponderable | (adjective) difficult or impossible to evaluate with precision | - |
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| importunate | (adjective) persistent to the point of annoying | - |
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| (adjective) expressing persistant and earnest entreaty | - |
| impossible | (adjective) not capable of occurring or being accomplished or dealt with | - |
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| (adjective) (used of persons or their behavior) not acceptable or reasonable | Synonyms: unacceptable |
| (adjective) totally unlikely | Synonyms: inconceivable, out of the question, unimaginable |
| impracticable | (adjective) not capable of being carried out or put into practice | Synonyms: infeasible, unfeasible, unworkable |
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| imprecise | (adjective) not precise | - |
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| impregnable | (adjective) capable of conceiving | Synonyms: conceptive |
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| (adjective) immune to attack; incapable of being tampered with | Synonyms: inviolable, secure, strong, unassailable, unattackable |
| (adjective) incapable of being overcome, challenged or refuted | Synonyms: inexpugnable |
| impressible | (adjective) easily impressed or influenced | Synonyms: impressionable, waxy |
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| impressionable | (adjective) easily impressed or influenced | Synonyms: impressible, waxy |
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| impressive | (adjective) making a strong or vivid impression | - |
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| (adjective) producing a strong effect | Synonyms: telling |
| improbable | (adjective) not likely to be true or to occur or to have occurred | Synonyms: unlikely |
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| (adjective) having a probability too low to inspire belief | Synonyms: unbelievable, unconvincing, unlikely |
| (adjective) too improbable to admit of belief | Synonyms: marvellous, marvelous, tall |
| improvable | (adjective) susceptible of improvement | - |
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| impugnable | (adjective) subject to being discredited | - |
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| impulsive | (adjective) determined by chance or impulse or whim rather than by necessity or reason | Synonyms: capricious, whimsical |
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| (adjective) having the power of driving or impelling | Synonyms: driving |
| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, hotheaded, impetuous, madcap, tearaway |
| (adjective) proceeding from natural feeling or impulse without external stimulus | Synonyms: unprompted |
| (adjective) without forethought | - |
| impure | (adjective) (used of persons or behaviors) immoral or obscene | - |
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| (adjective) combined with extraneous elements | - |
| (adjective) having a physical or moral blemish so as to make impure according to dietary or ceremonial laws | Synonyms: unclean |
| imputable | (adjective) capable of being assigned or credited to | Synonyms: ascribable, due, referable |
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| imputrescible | (adjective) not subject to decay | - |
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| inaccessible | (adjective) capable of being reached only with great difficulty or not at all | Synonyms: unaccessible |
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| (adjective) not capable of being obtained | Synonyms: unobtainable, unprocurable, untouchable |
| inaccurate | (adjective) erroneous | - |
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| inactive | (adjective) (military) not involved in military operations | Synonyms: nonoperational |
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| (adjective) not active physically or mentally | - |
| (adjective) (pathology) not progressing or increasing; or progressing slowly | - |
| (adjective) lacking activity; lying idle or unused | - |
| (adjective) lacking in energy or will | Synonyms: passive |
| (adjective) (of e.g. volcanoes) not erupting and not extinct | Synonyms: dormant |
| (adjective) not exerting influence or change | - |
| (adjective) not engaged in full-time work | - |
| (adjective) not in physical motion | Synonyms: motionless, static, still |
| (adjective) (chemistry) not participating in a chemical reaction; chemically inert | - |
| inadequate | (adjective) lacking the requisite qualities or resources to meet a task | Synonyms: unequal |
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| (adjective) of insufficient quantity to meet a need | Synonyms: jejune, poor, short |
| inadmissible | (adjective) not deserving to be admitted | - |
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| inadvisable | (adjective) not prudent or wise; not recommended | Synonyms: unadvisable |
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| (adjective) not advisable | - |
| 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 |
| 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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| 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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| incalculable | (adjective) not able to be computed or enumerated | - |
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| (adjective) too much to be measured | Synonyms: untold |
| incapable | (adjective) (followed by `of') lacking capacity or ability | - |
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| (adjective) (followed by `of') not having the temperament or inclination for | - |
| (adjective) not meeting requirements | Synonyms: incompetent, unequal to |
| (adjective) not being susceptible to or admitting of something (usually followed by `of') | - |
| 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 |
| inceptive | (adjective) in an initial stage | Synonyms: inchoative |
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| inchoate | (adjective) only partly in existence; imperfectly formed | Synonyms: incipient |
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| inchoative | (adjective) in an initial stage | Synonyms: inceptive |
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| incisive | (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, keen, knifelike, penetrating, penetrative, piercing, sharp |
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| (adjective) suitable for cutting or piercing | - |
| incitive | (adjective) arousing to action or rebellion | Synonyms: incendiary, inflammatory, instigative, rabble-rousing, seditious |
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| inclusive | (adjective) including much or everything; and especially including stated limits | - |
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| incognizable | (adjective) incapable of being perceived or known | Synonyms: incognoscible |
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| incognoscible | (adjective) incapable of being perceived or known | Synonyms: incognizable |
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| incombustible | (adjective) not capable of igniting and burning | Synonyms: noncombustible |
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| incommensurable | (adjective) not having a common factor | - |
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| (adjective) impossible to measure or compare in value or size or excellence | - |
| incommensurate | (adjective) not corresponding in size or degree or extent | - |
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| incommunicative | (adjective) not inclined to talk or give information or express opinions | Synonyms: uncommunicative |
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| incommutable | (adjective) not subject to alteration or change | - |
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| (adjective) not interchangeable or able to substitute one for another | - |
| incomparable | (adjective) such that comparison is impossible; unsuitable for comparison or lacking features that can be compared | Synonyms: uncomparable |
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| incompatible | (adjective) used especially of drugs or muscles that counteract or neutralize each other's effect | Synonyms: antagonistic |
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| (adjective) not compatible | - |
| (adjective) incapable of being used with or connected to other devices or components without modification | - |
| (adjective) not suitable to your tastes or needs | Synonyms: uncongenial |
| (adjective) of words so related that one contrasts with the other | Synonyms: contrastive |
| (adjective) used especially of solids or solutions; incapable of blending into a stable homogeneous mixture | - |
| (adjective) not in keeping with what is correct or proper | Synonyms: inappropriate, out of keeping, unfitting |
| (adjective) not compatible with other facts | Synonyms: discrepant |
| (adjective) not easy to combine harmoniously | Synonyms: ill-sorted, mismated, unsuited |