| imaginable | (adjective) capable of being imagined | Synonyms: conceivable |
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| imaginary | (adjective) not based on fact; existing only in the imagination | Synonyms: fanciful, notional |
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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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| imbalanced | (adjective) being or thrown out of equilibrium | Synonyms: unbalanced |
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| imbecile | (adjective) having a mental age of three to seven years | Synonyms: idiotic, imbecilic |
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| imbecilic | (adjective) having a mental age of three to seven years | Synonyms: idiotic, imbecile |
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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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| imbricated | (adjective) used especially of leaves or bracts; overlapping or layered as scales or shingles | Synonyms: imbricate |
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| imbued | (adjective) (followed by `with') deeply filled or permeated | Synonyms: instinct, replete |
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| imitation | (adjective) not genuine or real; being an imitation of the genuine article | Synonyms: fake, false, faux, simulated |
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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 |
| immanent | (adjective) of a mental act performed entirely within the mind | Synonyms: subjective |
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| (adjective) of qualities that are spread throughout something | - |
| immaterial | (adjective) not consisting of matter | Synonyms: nonmaterial |
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| (adjective) of no importance or relevance especially to a law case | - |
| (adjective) without material form or substance | Synonyms: incorporeal |
| (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, impertinent, orthogonal |
| (adjective) (often followed by `to') lacking importance; not mattering one way or the other | Synonyms: indifferent |
| 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 | - |
| immemorial | (adjective) long past; beyond the limits of memory or tradition or recorded history | - |
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| 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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| imminent | (adjective) close in time; about to occur | Synonyms: at hand, close at hand, impendent, impending |
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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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| immodest | (adjective) lacking decorum or decency | - |
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| (adjective) having or showing an exaggerated opinion of your importance, ability, etc | - |
| immoral | (adjective) deliberately violating accepted principles of right and wrong | - |
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| (adjective) not adhering to ethical or moral principles | Synonyms: base |
| immortal | (adjective) not subject to death | - |
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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 |
| immunised | (adjective) having been rendered unsusceptible to a disease | Synonyms: immunized, vaccinated |
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| immunized | (adjective) having been rendered unsusceptible to a disease | Synonyms: immunised, vaccinated |
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| immunochemical | (adjective) of or relating to immunochemistry | - |
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| immunocompetent | (adjective) capable of developing an immune response following exposure to an antigen | - |
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| immunocompromised | (adjective) unable to develop a normal immune response usually because of malnutrition or immunodeficiency or immunosuppressive therapy | - |
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| immunodeficient | (adjective) incapable of developing an immune response following exposure to an antigen | - |
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| immunogenic | (adjective) possessing the ability to elicit an immune response | - |
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| immunologic | (adjective) of or relating to immunology | Synonyms: immunological |
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| immunological | (adjective) of or relating to immunology | Synonyms: immunologic |
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| immunosuppressed | (adjective) of persons whose immune response is inadequate | - |
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| immunosuppressive | (adjective) of or relating to a substance that lowers the body's normal immune response and induces immunosuppression | - |
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| immunotherapeutic | (adjective) of or relating to immunotherapy | - |
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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 | - |
| impacted | (adjective) wedged or packed in together | Synonyms: wedged |
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| impaired | (adjective) diminished in strength, quality, or utility | - |
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| (adjective) mentally or physically unfit | Synonyms: afflicted |
| 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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| impartial | (adjective) showing lack of favoritism | - |
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| (adjective) free from undue bias or preconceived opinions | Synonyms: unprejudiced |
| impassable | (adjective) incapable of being passed | Synonyms: unpassable |
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| impassioned | (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, fiery, perfervid, torrid |
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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 |
| impatient | (adjective) restless or short-tempered under delay or opposition | - |
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| (adjective) (usually followed by `to') full of eagerness | Synonyms: raring |
| impeccable | (adjective) without fault or error | Synonyms: faultless, immaculate, incorrupted |
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| (adjective) not capable of sin | - |
| impeccant | (adjective) free from sin | Synonyms: innocent, sinless |
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| impecunious | (adjective) not having enough money to pay for necessities | Synonyms: hard up, in straitened circumstances, penniless, penurious, pinched |
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| impeded | (adjective) made difficult or slow | - |
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| impeding | (adjective) preventing movement | Synonyms: clogging, hindering, obstructive |
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| impelled | (adjective) urged or forced to action through moral pressure | Synonyms: driven |
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| impellent | (adjective) forcing forward or onward; impelling | - |
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| impelling | (adjective) markedly effective as if by emotional pressure | - |
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| impendent | (adjective) close in time; about to occur | Synonyms: at hand, close at hand, imminent, impending |
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| impending | (adjective) close in time; about to occur | Synonyms: at hand, close at hand, imminent, impendent |
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| 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 |
| impenitent | (adjective) not penitent or remorseful | Synonyms: unremorseful, unrepentant |
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| (adjective) impervious to moral persuasion | - |
| 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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| imperfect | (adjective) not perfect; defective or inadequate | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: fallible, frail, weak |
| imperfectible | (adjective) capable of being made imperfect | - |
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| imperforate | (adjective) not perforated; having no opening | - |
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| imperial | (adjective) befitting or belonging to an emperor or empress | - |
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| (adjective) relating to or associated with an empire | - |
| (adjective) of or belonging to the British Imperial System of weights and measures | - |
| (adjective) belonging to or befitting a supreme ruler | Synonyms: majestic, purple, regal, royal |
| imperialist | (adjective) of or relating to imperialism | Synonyms: imperialistic |
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| imperialistic | (adjective) of or relating to imperialism | Synonyms: imperialist |
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| imperious | (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: disdainful, haughty, lordly, overbearing, prideful, sniffy, supercilious, swaggering |
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| imperishable | (adjective) not perishable | - |
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| (adjective) lasting a long time | Synonyms: abiding, enduring |
| impermanent | (adjective) not permanent; not lasting | Synonyms: temporary |
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| (adjective) existing or enduring for a limited time only | - |
| 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 | - |
| impersonal | (adjective) not relating to or responsive to individual persons | - |
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| (adjective) having no personal preference | Synonyms: neutral |
| impertinent | (adjective) improperly forward or bold | Synonyms: fresh, impudent, overbold, sassy, saucy, smart, wise |
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| (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, orthogonal |
| (adjective) characterized by a lightly pert and exuberant quality | Synonyms: irreverent, pert, saucy |
| 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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| impervious | (adjective) not admitting of passage or capable of being affected | Synonyms: imperviable |
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| impetiginous | (adjective) of or relating to or having impetigo | - |
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| impetuous | (adjective) marked by violent force | - |
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| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, hotheaded, impulsive, madcap, tearaway |
| impious | (adjective) lacking piety or reverence for a god | - |
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| (adjective) lacking due respect or dutifulness | Synonyms: undutiful |
| impish | (adjective) naughtily or annoyingly playful | Synonyms: arch, implike, mischievous, pixilated, prankish, puckish, wicked |
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| implacable | (adjective) incapable of being placated | - |
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| implanted | (adjective) (used especially of ideas or principles) deeply rooted; firmly fixed or held | Synonyms: deep-rooted, deep-seated, ingrained, planted |
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| implausible | (adjective) having a quality that provokes disbelief | - |
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| implemental | (adjective) serving or acting as a means or aid | Synonyms: instrumental, subservient |
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| implemented | (adjective) forced or compelled or put in force | Synonyms: enforced |
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| implicated | (adjective) culpably involved | Synonyms: concerned |
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| implicational | (adjective) relating to or concerned with logical implication | - |
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| implicative | (adjective) tending to suggest or imply | Synonyms: suggestive |
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| implicit | (adjective) implied though not directly expressed; inherent in the nature of something | Synonyms: inexplicit |
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| (adjective) being without doubt or reserve | Synonyms: unquestioning |
| implike | (adjective) naughtily or annoyingly playful | Synonyms: arch, impish, mischievous, pixilated, prankish, puckish, wicked |
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| imploring | (adjective) begging | Synonyms: beseeching, pleading |
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| impolite | (adjective) not polite | - |
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| impolitic | (adjective) not politic | - |
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