| indusial | (adjective) of or relating to or being an indusium | - |
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| inexpensive | (adjective) relatively low in price or charging low prices | Synonyms: cheap |
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| inexpressible | (adjective) defying expression | Synonyms: unexpressible |
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| inexpressive | (adjective) not expressive | - |
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| inextensible | (adjective) not extensile | Synonyms: nonextensile, nonprotractile |
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| infeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, unfeasible, unworkable |
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| infinitesimal | (adjective) infinitely or immeasurably small | Synonyms: minute |
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| inoffensive | (adjective) giving no offense | - |
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| (adjective) not causing anger or annoyance | Synonyms: unoffending |
| inquisitive | (adjective) showing curiosity | Synonyms: questioning, speculative, wondering |
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| (adjective) inquiring or appearing to inquire | - |
| inquisitorial | (adjective) especially indicating a form of prosecution in which proceedings are secret and the accused is questioned by a prosecutor who acts also as the judge | - |
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| (adjective) having the authority to conduct official investigations | - |
| (adjective) marked by inquisitive interest; especially suggestive of an ecclesiastical inquisitor | - |
| inquisitory | (adjective) diligent and thorough in inquiry or investigation | Synonyms: probing, searching |
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| insensible | (adjective) incapable of physical sensation | - |
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| (adjective) barely able to be perceived | Synonyms: indiscernible, undetectable |
| (adjective) unresponsive to stimulation | Synonyms: out of it, senseless |
| (adjective) unaware of or indifferent to | Synonyms: unaffected |
| insensitive | (adjective) not responsive to physical stimuli | - |
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| (adjective) deficient in human sensibility; not mentally or morally sensitive | - |
| inside | (adjective) relating to or being on the side closer to the center or within a defined space | - |
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| (adjective) confined to an exclusive group | Synonyms: inner, privileged |
| (adjective) away from the outer edge | - |
| (adjective) being or applying to the inside of a building | - |
| insidious | (adjective) intended to entrap | - |
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| (adjective) working or spreading in a hidden and usually injurious way | Synonyms: pernicious, subtle |
| (adjective) beguiling but harmful | - |
| insightful | (adjective) exhibiting insight or clear and deep perception | - |
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| insignificant | (adjective) devoid of importance, meaning, or force | Synonyms: unimportant |
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| (adjective) signifying nothing | - |
| (adjective) of little importance or influence or power; of minor status | Synonyms: peanut |
| (adjective) small and unimpressive | Synonyms: dinky |
| insincere | (adjective) lacking sincerity | - |
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| insinuating | (adjective) calculated to please or gain favor | Synonyms: ingratiating, ingratiatory |
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| insipid | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, savorless, savourless, vapid |
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| (adjective) lacking interest or significance or impact | Synonyms: jejune |
| insistent | (adjective) repetitive and persistent | Synonyms: repetitive |
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| (adjective) demanding attention | Synonyms: clamant, crying, exigent, instant |
| intensified | (adjective) made more intense | - |
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| intensifying | (adjective) increasing in strength or intensity | - |
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| intensional | (adjective) used of the set of attributes that distinguish the referents of a given word | - |
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| 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 | - |
| 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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| 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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| introversive | (adjective) directed inward; marked by interest in yourself or concerned with inner feelings | Synonyms: introvertive |
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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 | - |
| 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 |
| 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 |
| ipsilateral | (adjective) on or relating to the same side (of the body) | - |
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| irrepressible | (adjective) impossible to repress or control | Synonyms: uncontrollable |
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| irresistible | (adjective) impossible to resist; overpowering | Synonyms: resistless |
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| (adjective) overpoweringly attractive | - |
| irresponsible | (adjective) showing lack of care for consequences | - |
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| irreversible | (adjective) incapable of being reversed | - |
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| lackadaisical | (adjective) idle or indolent especially in a dreamy way | - |
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| (adjective) lacking spirit or liveliness | Synonyms: dreamy, languid, languorous |
| larghissimo | (adjective) (of tempo) as slow and broad as possible | - |
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| lentissimo | (adjective) (of tempo) very slow | - |
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| lifesize | (adjective) being of the same size as an original | Synonyms: full-size, life-size, life-sized |
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| longsighted | (adjective) capable of seeing to a great distance | Synonyms: eagle-eyed, farseeing, keen-sighted |
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| (adjective) planning prudently for the future | Synonyms: farseeing, farsighted, foresighted, foresightful, long, prospicient |
| lopsided | (adjective) having one side lower or smaller or lighter than the other | - |
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| (adjective) turned or twisted toward one side | Synonyms: askew, awry, cockeyed, skew-whiff, wonky |
| lovesick | (adjective) languishing because of love | - |
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| massive | (adjective) consisting of great mass; containing a great quantity of matter | - |
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| (adjective) imposing in size or bulk or solidity | Synonyms: monolithic, monumental |
| (adjective) being the same substance throughout | - |
| (adjective) imposing in scale or scope or degree or power | - |
| maximising | (adjective) making as great as possible | Synonyms: maximizing |
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| mesial | (adjective) being in or directed toward the midline or mesial plane of the body | - |
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| mesic | (adjective) having or characterized by moderate or a well-balanced supply of moisture | - |
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| (adjective) of or pertaining to a meson | Synonyms: mesonic |
| messianic | (adjective) of or relating to a messiah promising deliverance | - |
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| metaphysical | (adjective) pertaining to or of the nature of metaphysics | - |
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| (adjective) transcending physical matter or the laws of nature | - |
| (adjective) highly abstract and overly theoretical | - |
| missing | (adjective) not able to be found | - |
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| (adjective) nonexistent | Synonyms: absent, lacking, wanting |
| missional | (adjective) relating to or connected to a religious mission | Synonyms: missionary |
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| missionary | (adjective) relating to or connected to a religious mission | Synonyms: missional |
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| multidimensional | (adjective) having or involving or marked by several dimensions or aspects | - |
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| musical | (adjective) characteristic of or resembling or accompanied by music | - |
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| (adjective) talented in or devoted to music | - |
| (adjective) containing or constituting or characterized by pleasing melody | Synonyms: melodic, melodious |
| (adjective) characterized by or capable of producing music | - |
| musicological | (adjective) of or relating to musicology | - |
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| musing | (adjective) deeply or seriously thoughtful | Synonyms: brooding, broody, contemplative, meditative, pensive, pondering, reflective, ruminative |
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| narcissistic | (adjective) characteristic of those having an inflated idea of their own importance | Synonyms: egotistic, egotistical, self-loving |
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| narcotising | (adjective) inducing stupor or narcosis | Synonyms: narcotic, narcotizing |
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| nearsighted | (adjective) unable to see distant objects clearly | Synonyms: myopic, shortsighted |
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| necessitous | (adjective) poor enough to need help from others | Synonyms: destitute, impoverished, indigent, needy, poverty-stricken |
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| neoclassic | (adjective) characteristic of a revival of an earlier classical style | Synonyms: neoclassical |
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| neoclassical | (adjective) characteristic of a revival of an earlier classical style | Synonyms: neoclassic |
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| neoclassicist | (adjective) relating to or advocating neoclassicism | Synonyms: neoclassicistic |
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| neoclassicistic | (adjective) relating to or advocating neoclassicism | Synonyms: neoclassicist |
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| neurophysiological | (adjective) of or concerned with neurophysiology | - |
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| nisi | (adjective) not final or absolute | - |
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| nonadhesive | (adjective) not tending to adhere | - |
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| nonaggressive | (adjective) not aggressive; not given to fighting or assertiveness | Synonyms: unaggressive |
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| nonclassical | (adjective) not classical | - |
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| noncollapsible | (adjective) not capable of collapsing | Synonyms: noncollapsable |
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| noncommissioned | (adjective) (of military officers) appointed from enlisted personnel | - |
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| noncomprehensive | (adjective) not comprehensive | Synonyms: incomprehensive |
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| noncontroversial | (adjective) not likely to arouse controversy | Synonyms: uncontroversial |
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| nonenterprising | (adjective) lacking in enterprise; not bold or venturesome | Synonyms: unenterprising |
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| nonexplosive | (adjective) not explosive | - |
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| nonextensile | (adjective) not extensile | Synonyms: inextensible, nonprotractile |
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| nonfissile | (adjective) not fissile | - |
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| nonfissionable | (adjective) not capable of undergoing fission | - |
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| noninvasive | (adjective) relating to a technique that does not involve puncturing the skin or entering a body cavity | - |
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| nonmusical | (adjective) not musical in nature | Synonyms: unmusical |
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| (adjective) lacking interest in or talent for music | Synonyms: unmusical |
| nonparasitic | (adjective) not parasitic on another organism | Synonyms: free-living, nonsymbiotic |
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| nonphysical | (adjective) lacking substance or reality; incapable of being touched or seen | Synonyms: intangible |
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| nonprehensile | (adjective) not prehensile | - |
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| nonprofessional | (adjective) not professional; not engaged in a profession or engaging in as a profession or for gain | - |
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| nonprogressive | (adjective) old-fashioned and out of date | Synonyms: fusty, standpat, unprogressive |
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| nonresident | (adjective) not living in a particular place or owned by permanent residents | - |
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| nonresidential | (adjective) not residential | - |
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| nonresilient | (adjective) not resilient | - |
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| nonresinous | (adjective) not having resin | Synonyms: non-resinous, non-resiny, nonresiny |
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| nonresiny | (adjective) not having resin | Synonyms: non-resinous, non-resiny, nonresinous |
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| nonresistant | (adjective) offering no resistance, compliant | - |
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| (adjective) (often followed by `to') likely to be affected with | Synonyms: liable, nonimmune, unresistant |
| nonreversible | (adjective) not reversible or capable of having either side out | Synonyms: one-sided |
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| nonsensical | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, idiotic, laughable, ludicrous, preposterous, ridiculous |
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| (adjective) having no intelligible meaning | Synonyms: nonsense |
| nonsensitive | (adjective) never having had security classification | Synonyms: unrestricted |
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| nonsignificant | (adjective) attributable to chance | - |
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| nonsubmersible | (adjective) not submersible or submergible | Synonyms: nonsubmergible |
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| nontransmissible | (adjective) (of disease) not capable of being passed on | Synonyms: noncommunicable, noncontagious |
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| (adjective) not acquirable by inheritance | Synonyms: nonhereditary |
| normotensive | (adjective) having normal blood pressure | - |
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