| inquisitive | (adjective) showing curiosity | Synonyms: questioning, speculative, wondering |
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| (adjective) inquiring or appearing to inquire | - |
| inscriptive | (adjective) of or relating to an inscription | - |
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| insectivorous | (adjective) (of animals and plants) feeding on insects | - |
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| insensitive | (adjective) not responsive to physical stimuli | - |
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| (adjective) deficient in human sensibility; not mentally or morally sensitive | - |
| insolvable | (adjective) not easily solved | Synonyms: unresolvable, unsoluble, unsolvable |
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| insolvent | (adjective) unable to meet or discharge financial obligations | - |
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| instigative | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, inflammatory, rabble-rousing, seditious |
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| instinctive | (adjective) unthinking; prompted by (or as if by) instinct | Synonyms: natural |
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| instructive | (adjective) serving to instruct or enlighten or inform | Synonyms: informative |
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| integrative | (adjective) combining and coordinating diverse elements into a whole | - |
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| (adjective) tending to consolidate | Synonyms: consolidative |
| intensive | (adjective) of agriculture; intended to increase productivity of a fixed area by expending more capital and labor | - |
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| (adjective) tending to give force or emphasis | - |
| (adjective) characterized by a high degree or intensity; often used as a combining form | - |
| interactive | (adjective) used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more) | Synonyms: synergistic |
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| (adjective) capable of acting on or influencing each other | Synonyms: interactional |
| interoceptive | (adjective) of or relating to interoception | - |
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| interpretative | (adjective) that provides interpretation | Synonyms: interpretive |
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| interpretive | (adjective) that provides interpretation | Synonyms: interpretative |
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| interrogative | (adjective) relating to the use of or having the nature of an interrogation | Synonyms: interrogatory |
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| (adjective) relating to verbs in the so-called interrogative mood | - |
| intervening | (adjective) occurring or falling between events or points in time | - |
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| intervertebral | (adjective) pertaining to the space between two vertebrae | - |
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| interwoven | (adjective) linked or locked closely together as by dovetailing | Synonyms: interlacing, interlinking, interlocking |
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| intransitive | (adjective) designating a verb that does not require or cannot take a direct object | - |
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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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| 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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| 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 | - |
| 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 | - |
| 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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| irrecoverable | (adjective) incapable of being recovered or regained | Synonyms: unrecoverable |
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| irrelevant | (adjective) having no bearing on or connection with the subject at issue | - |
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| irremovable | (adjective) incapable of being removed or away or dismiss | - |
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| irretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: unretrievable |
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| irreverent | (adjective) showing lack of due respect or veneration | - |
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| (adjective) not revering god | Synonyms: godless |
| (adjective) characterized by a lightly pert and exuberant quality | Synonyms: impertinent, pert, saucy |
| irreversible | (adjective) incapable of being reversed | - |
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| irrevocable | (adjective) incapable of being retracted or revoked | Synonyms: irrevokable |
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| irrevokable | (adjective) incapable of being retracted or revoked | Synonyms: irrevocable |
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| irritative | (adjective) (used of physical stimuli) serving to stimulate or excite | Synonyms: irritating |
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| irruptive | (adjective) of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro | Synonyms: plutonic |
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| iterative | (adjective) marked by iteration | Synonyms: reiterative |
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| iv | (adjective) being one more than three | Synonyms: 4, four |
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| ivied | (adjective) overgrown with ivy | Synonyms: ivy-covered |
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| jovial | (adjective) full of or showing high-spirited merriment | Synonyms: gay, jocund, jolly, merry, mirthful |
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| justificative | (adjective) attempting to justify or defend in speech or writing | Synonyms: defensive, justificatory |
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| (adjective) providing justification | Synonyms: justificatory, vindicatory |
| juvenile | (adjective) of or relating to or characteristic of or appropriate for children or young people | - |
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| (adjective) displaying or suggesting a lack of maturity | Synonyms: adolescent, jejune, puerile |
| knavish | (adjective) marked by skill in deception | Synonyms: crafty, cunning, dodgy, foxy, guileful, slick, sly, tricksy, tricky, wily |
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| laborsaving | (adjective) designed to replace or conserve human and especially manual labor | Synonyms: laboursaving |
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| laboursaving | (adjective) designed to replace or conserve human and especially manual labor | Synonyms: laborsaving |
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| larval | (adjective) relating to or typical of a larva | - |
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| (adjective) immature of its kind; especially being or characteristic of immature insects in the newly hatched wormlike feeding stage | - |
| lascivious | (adjective) driven by lust; preoccupied with or exhibiting lustful desires | Synonyms: lewd, libidinous, lustful |
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| lavender | (adjective) of a pale purple color | Synonyms: lilac-colored, lilac |
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| lavish | (adjective) very generous | Synonyms: munificent, overgenerous, too-generous, unsparing, unstinted, unstinting |
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| (adjective) characterized by extravagance and profusion | Synonyms: lucullan, plush, plushy |
| laxative | (adjective) stimulating evacuation of feces | - |
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| leaved | (adjective) having leaves or leaves as specified; often used in combination | Synonyms: leafed |
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| leavened | (adjective) made light by aerating, as with yeast or baking powder; often used as a combining form | - |
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| leftover | (adjective) not used up | Synonyms: left, left over, odd, remaining, unexpended |
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| legislative | (adjective) of or relating to or created by legislation | - |
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| (adjective) relating to a legislature or composed of members of a legislature | - |
| lenitive | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviative, alleviatory, mitigative, mitigatory, palliative |
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| level | (adjective) of the score in a contest | Synonyms: even, tied |
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| (adjective) being on a precise horizontal plane | - |
| (adjective) not showing abrupt variations | Synonyms: unwavering |
| (adjective) having a surface without slope, tilt in which no part is higher or lower than another | Synonyms: flat, plane |
| (adjective) oriented at right angles to the plumb | - |
| levelheaded | (adjective) exercising or showing good judgment | Synonyms: healthy, intelligent, level-headed, sound |
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| levorotary | (adjective) rotating to the left | Synonyms: left-handed, levorotatory |
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| levorotatory | (adjective) rotating to the left | Synonyms: left-handed, levorotary |
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| liv | (adjective) being four more than fifty | Synonyms: 54, fifty-four |
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| livable | (adjective) fit or suitable to live in or with | Synonyms: liveable |
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| live | (adjective) possessing life | Synonyms: alive |
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| (adjective) exerting force or containing energy | - |
| (adjective) actually being performed at the time of hearing or viewing | Synonyms: unrecorded |
| (adjective) charged or energized with electricity | Synonyms: hot |
| (adjective) of current relevance | - |
| (adjective) elastic; rebounds readily | Synonyms: bouncy, lively, resilient, springy |
| (adjective) abounding with life and energy | - |
| (adjective) charged with an explosive | - |
| (adjective) highly reverberant | - |
| (adjective) in current use or ready for use | - |
| (adjective) capable of erupting | Synonyms: alive |
| liveable | (adjective) fit or suitable to live in or with | Synonyms: livable |
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| liveborn | (adjective) (of newborn infant) showing signs of life after birth; not stillborn | - |
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| livelong | (adjective) (of time) constituting the full extent or duration | - |
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