| 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 |