| invading | (adjective) involving invasion or aggressive attack | Synonyms: incursive, invasive |
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| invalid | (adjective) having no cogency or legal force | - |
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| (adjective) no longer valid | - |
| invalidated | (adjective) deprived of legal force | Synonyms: nullified |
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| invalidating | (adjective) establishing as invalid or untrue | Synonyms: disconfirming |
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| invaluable | (adjective) having incalculable monetary, intellectual, or spiritual worth | Synonyms: priceless |
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| invariable | (adjective) not liable to or capable of change | - |
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| invariant | (adjective) unvarying in nature | Synonyms: changeless, constant, unvarying |
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| (adjective) unaffected by a designated operation or transformation | - |
| invasive | (adjective) marked by a tendency to spread especially into healthy tissue | - |
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| (adjective) relating to a technique in which the body is entered by puncture or incision | - |
| (adjective) gradually intrusive without right or permission | Synonyms: encroaching, trespassing |
| (adjective) involving invasion or aggressive attack | Synonyms: incursive, invading |