| 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 | - |