| inventive | (adjective) (used of persons or artifacts) marked by independence and creativity in thought or action | Synonyms: imaginative |
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| inverse | (adjective) opposite in nature or effect or relation to another quantity | - |
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| (adjective) reversed (turned backward) in order or nature or effect | Synonyms: reverse |
| invertebrate | (adjective) lacking a backbone or spinal column | Synonyms: spineless |
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| inverted | (adjective) (of a plant ovule) completely inverted; turned back 180 degrees on its stalk | Synonyms: anatropous |
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| (adjective) being in such a position that top and bottom are reversed | Synonyms: upside-down |
| invertible | (adjective) having an additive or multiplicative inverse | - |
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| investigative | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigatory |
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| investigatory | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigative |
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| inveterate | (adjective) habitual | Synonyms: chronic |
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