| 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| (adjective) no longer valid | - |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 |
| 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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| invidious | (adjective) containing or implying a slight or showing prejudice | Synonyms: discriminatory |
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| invigorated | (adjective) with restored energy | Synonyms: fresh, refreshed, reinvigorated |
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| invigorating | (adjective) imparting strength and vitality | - |
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| invincible | (adjective) incapable of being overcome or subdued | Synonyms: unbeatable, unvanquishable |
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| inviolable | (adjective) incapable of being transgressed or dishonored | - |
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| (adjective) not capable of being violated or infringed | Synonyms: absolute, infrangible |
| (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, secure, strong, unassailable, unattackable |
| (adjective) must be kept sacred | Synonyms: inviolate, sacrosanct |
| inviolate | (adjective) must be kept sacred | Synonyms: inviolable, sacrosanct |
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| (adjective) (of a woman) having the hymen unbroken | Synonyms: intact |
| invisible | (adjective) impossible or nearly impossible to see; imperceptible by the eye | Synonyms: unseeable |
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| (adjective) not prominent or readily noticeable | Synonyms: inconspicuous |
| invitational | (adjective) pertaining to or characteristic of an invitation | - |
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| invitatory | (adjective) conveying an invitation | - |
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| inviting | (adjective) attractive and tempting | - |
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| involucrate | (adjective) having an involucre | - |
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| involuntary | (adjective) not subject to the control of the will | Synonyms: nonvoluntary, unvoluntary |
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| (adjective) controlled by the autonomic nervous system; without conscious control | - |
| involute | (adjective) (of some shells) closely coiled so that the axis is obscured | - |
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| (adjective) especially of petals or leaves in bud; having margins rolled inward | Synonyms: rolled |
| involved | (adjective) connected by participation or association or use | - |
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| (adjective) emotionally involved | - |
| (adjective) highly complex or intricate and occasionally devious | Synonyms: Byzantine, convoluted, knotty, labyrinthine, tangled, tortuous |
| (adjective) enveloped | - |
| (adjective) entangled or hindered as if e.g. in mire | Synonyms: mired |
| invulnerable | (adjective) immune to attack; impregnable | - |
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