| intoned | (adjective) uttered in a monotonous cadence or rhythm as in chanting | Synonyms: chantlike, singsong |
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| intoxicant | (adjective) causing intoxication | Synonyms: intoxicating |
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| intoxicated | (adjective) stupefied or excited by a chemical substance (especially alcohol) | Synonyms: drunk, gone, inebriated, ripped |
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| (adjective) as if under the influence of alcohol | Synonyms: drunk |
| intoxicating | (adjective) causing intoxication | Synonyms: intoxicant |
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| (adjective) extremely exciting as if by alcohol or a narcotic | Synonyms: heady |
| intracellular | (adjective) located or occurring within a cell or cells | - |
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| intracerebral | (adjective) within the brain | - |
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| intracranial | (adjective) within the skull | - |
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| intractable | (adjective) not tractable; difficult to manage or mold | - |
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| intracutaneous | (adjective) relating to areas between the layers of the skin | Synonyms: intradermal, intradermic |
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| intradepartmental | (adjective) within a department | - |
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| intradermal | (adjective) relating to areas between the layers of the skin | Synonyms: intracutaneous, intradermic |
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| intradermic | (adjective) relating to areas between the layers of the skin | Synonyms: intracutaneous, intradermal |
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| intragroup | (adjective) occurring within an institution or community | Synonyms: internal |
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| intralinguistic | (adjective) within a particular language | - |
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| intralobular | (adjective) inside lobes or lobules | - |
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| intramolecular | (adjective) within the molecule; occurring by a reaction between different parts of the same molecule | - |
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| intramural | (adjective) carried on within the bounds of an institution or community | - |
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| intramuscular | (adjective) within a muscle | - |
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| intransigent | (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, adamantine, inexorable |
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| intransitive | (adjective) designating a verb that does not require or cannot take a direct object | - |
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| intrapulmonary | (adjective) being or occurring within a lung | - |
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| intrasentential | (adjective) of or relating to constituents within a sentence | - |
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| intraspecies | (adjective) arising or occurring within a species; involving the members of one species | Synonyms: intraspecific |
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| intraspecific | (adjective) arising or occurring within a species; involving the members of one species | Synonyms: intraspecies |
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| intrastate | (adjective) relating to or existing within the boundaries of a state | - |
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| intrauterine | (adjective) within the womb | - |
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| intravenous | (adjective) within or by means of a vein | Synonyms: endovenous |
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| intraventricular | (adjective) within the system of ventricles in the brain | - |
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| intrepid | (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, fearless, hardy, unfearing |
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| intricate | (adjective) having many complexly arranged elements; elaborate | - |
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| intriguing | (adjective) capable of arousing interest or curiosity | - |
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| (adjective) disturbingly provocative | Synonyms: challenging |
| intrinsic | (adjective) belonging to a thing by its very nature | Synonyms: intrinsical |
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| (adjective) situated within or belonging solely to the organ or body part on which it acts | - |
| intrinsical | (adjective) belonging to a thing by its very nature | Synonyms: intrinsic |
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| introductory | (adjective) serving as a base or starting point | Synonyms: basic |
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| (adjective) serving to open or begin | - |
| (adjective) serving as an introduction or preface | Synonyms: prefatorial, prefatory |
| introjected | (adjective) incorporated unconsciously into your own psyche | - |
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| introspective | (adjective) given to examining own sensory and perceptual experiences | Synonyms: introverted, self-examining |
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| introuvable | (adjective) impossible to find | - |
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| introversive | (adjective) directed inward; marked by interest in yourself or concerned with inner feelings | Synonyms: introvertive |
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| introverted | (adjective) given to examining own sensory and perceptual experiences | Synonyms: introspective, self-examining |
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| introvertish | (adjective) somewhat introverted | Synonyms: shut-in |
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| introvertive | (adjective) directed inward; marked by interest in yourself or concerned with inner feelings | Synonyms: introversive |
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| intruding | (adjective) projecting inward | - |
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| intrusive | (adjective) tending to intrude (especially upon privacy) | - |
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| (adjective) thrusting inward | - |
| (adjective) of rock material; forced while molten into cracks between layers of other rock | - |
| intuitionist | (adjective) of or relating to intuitionism | - |
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| intuitive | (adjective) obtained through intuition rather than from reasoning or observation | Synonyms: nonrational, visceral |
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| (adjective) spontaneously derived from or prompted by a natural tendency | - |
| intumescent | (adjective) abnormally distended especially by fluids or gas | Synonyms: bloated, distended, puffy, swollen, tumescent, tumid, turgid |
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| inundated | (adjective) covered with water | Synonyms: afloat, awash, flooded, overflowing |
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| inured | (adjective) made tough by habitual exposure | Synonyms: enured, hardened |
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| inutile | (adjective) not worth using | - |
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| 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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| inward | (adjective) relating to or existing in the mind or thoughts | - |
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| (adjective) directed or moving inward or toward a center | Synonyms: inbound |
| inwrought | (adjective) having a decorative pattern worked or woven in | - |
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