| incendiary | (adjective) involving deliberate burning of property | - |
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| (adjective) capable of catching fire spontaneously or causing fires or burning readily | - |
| (adjective) arousing to action or rebellion | Synonyms: incitive, inflammatory, instigative, rabble-rousing, seditious |
| (noun) a bomb that is designed to start fires; is most effective against flammable targets (such as fuel) | Synonyms: firebomb, incendiary bomb |
| (noun) a criminal who illegally sets fire to property | Synonyms: arsonist, firebug |
| incense | (noun) the pleasing scent produced when incense is burned | - |
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| (noun) a substance that produces a fragrant odor when burned | - |
| (verb) make furious | Synonyms: exasperate, infuriate |
| (verb) perfume especially with a censer | Synonyms: cense, thurify |
| incensed | (adjective) angered at something unjust or wrong | Synonyms: indignant, outraged, umbrageous |
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| incentive | (noun) a positive motivational influence | Synonyms: inducement, motivator |
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| (noun) an additional payment (or other remuneration) to employees as a means of increasing output | Synonyms: bonus |
| inception | (noun) an event that is a beginning; a first part or stage of subsequent events | Synonyms: origin, origination |
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| inceptive | (adjective) in an initial stage | Synonyms: inchoative |
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| incertain | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: uncertain, unsure |
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| incertitude | (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, dubiousness, uncertainty |
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| incessancy | (noun) the quality of something that continues without end or interruption | Synonyms: ceaselessness, continuousness, incessantness |
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| incessant | (adjective) uninterrupted in time and indefinitely long continuing | Synonyms: ceaseless, constant, never-ending, perpetual, unceasing, unremitting |
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| incessantly | (adverb) invariably | Synonyms: always, constantly, forever, perpetually |
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| (adverb) with unflagging resolve | Synonyms: ceaselessly, continuously, endlessly, unceasingly, unendingly |
| incessantness | (noun) the quality of something that continues without end or interruption | Synonyms: ceaselessness, continuousness, incessancy |
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| incest | (noun) sexual intercourse between persons too closely related to marry (as between a parent and a child) | - |
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| incestuous | (adjective) relating to or involving incest | - |
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| (adjective) resembling incest as by excessive intimacy | - |
| incestuously | (adverb) by incest | - |
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| incidence | (noun) the striking of a light beam on a surface | - |
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| (noun) the relative frequency of occurrence of something | Synonyms: relative incidence |
| incipience | (noun) beginning to exist or to be apparent | Synonyms: incipiency |
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| incognizance | (noun) a lack of knowledge or recognition | - |
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| incoherence | (noun) nonsense that is simply incoherent and unintelligible | Synonyms: incoherency, unintelligibility |
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| (noun) lack of cohesion or clarity or organization | Synonyms: incoherency |
| incompetence | (noun) lack of physical or intellectual ability or qualifications | Synonyms: incompetency |
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| (noun) inability of a part or organ to function properly | - |
| inconceivability | (noun) the state of being impossible to conceive | Synonyms: inconceivableness |
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| inconceivable | (adjective) totally unlikely | Synonyms: impossible, out of the question, unimaginable |
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| inconceivableness | (noun) the state of being impossible to conceive | Synonyms: inconceivability |
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| inconceivably | (adverb) to an inconceivable degree | - |
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| inconsequence | (noun) having no important effects or influence | - |
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| (noun) invalid or incorrect reasoning | Synonyms: illogic, illogicality, illogicalness |
| incontinence | (noun) indiscipline with regard to sensuous pleasures | Synonyms: dissoluteness, self-gratification |
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| (noun) involuntary urination or defecation | Synonyms: incontinency |
| inconvenience | (noun) the quality of not being useful or convenient | - |
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| (noun) a difficulty that causes anxiety | Synonyms: troublesomeness, worriment |
| (noun) an inconvenient discomfort | Synonyms: incommodiousness |
| (verb) to cause inconvenience or discomfort to | Synonyms: bother, discommode, disoblige, incommode, put out, trouble |
| incumbrance | (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, interference, preventative, preventive |
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| (noun) an onerous or difficult concern | Synonyms: burden, encumbrance, load, onus |
| (noun) a charge against property (as a lien or mortgage) | Synonyms: encumbrance |
| incurrence | (noun) the act of incurring (making yourself subject to something undesirable) | - |
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| independence | (noun) the successful ending of the American Revolution | - |
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| (noun) freedom from control or influence of another or others | Synonyms: independency |
| indifference | (noun) the trait of lacking enthusiasm for or interest in things generally | Synonyms: apathy, numbness, spiritlessness |
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| (noun) the trait of remaining calm and seeming not to care; a casual lack of concern | Synonyms: nonchalance, unconcern |
| (noun) unbiased impartial unconcern | - |
| (noun) apathy demonstrated by an absence of emotional reactions | Synonyms: emotionlessness, impassiveness, impassivity, phlegm, stolidity, unemotionality |
| indigence | (noun) a state of extreme poverty or destitution | Synonyms: need, pauperism, pauperization, penury |
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| indolence | (noun) inactivity resulting from a dislike of work | Synonyms: laziness |
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| inductance | (noun) an electrical device (typically a conducting coil) that introduces inductance into a circuit | Synonyms: inductor |
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| (noun) an electrical phenomenon whereby an electromotive force (EMF) is generated in a closed circuit by a change in the flow of current | Synonyms: induction |
| indulgence | (noun) the act of indulging or gratifying a desire | Synonyms: humoring, humouring, indulging, pampering |
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| (noun) foolish or senseless behavior | Synonyms: craziness, folly, foolery, lunacy, tomfoolery |
| (noun) the remission by the pope of the temporal punishment in purgatory that is still due for sins even after absolution | - |
| (noun) an inability to resist the gratification of whims and desires | Synonyms: self-indulgence |
| (noun) a disposition to yield to the wishes of someone | Synonyms: lenience, leniency |
| inelegance | (noun) the quality of lacking refinement and good taste | - |
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| inexpedience | (noun) the quality of being unsuited to the end in view | Synonyms: inexpediency |
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| inexperience | (noun) lack of experience and the knowledge and understanding derived from experience | Synonyms: rawness |
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| inexperienced | (adjective) lacking practical experience or training | Synonyms: inexperient |
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| inference | (noun) the reasoning involved in drawing a conclusion or making a logical judgment on the basis of circumstantial evidence and prior conclusions rather than on the basis of direct observation | Synonyms: illation |
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| inflorescence | (noun) the flowering part of a plant or arrangement of flowers on a stalk | - |
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| (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, efflorescence, florescence, flowering |
| influence | (noun) causing something without any direct or apparent effort | - |
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| (noun) a power to affect persons or events especially power based on prestige etc | - |
| (noun) a cognitive factor that tends to have an effect on what you do | - |
| (noun) one having power to influence another | - |
| (noun) the effect of one thing (or person) on another | - |
| (verb) shape or influence; give direction to | Synonyms: determine, mold, mould, regulate, shape |
| (verb) induce into action by using one's charm | Synonyms: charm, tempt |
| (verb) have and exert influence or effect | Synonyms: act upon, work |
| influencer | (noun) a person who has a large following on one or more social media platform that works to generate interest in contemporary social issues and/or advertise consumer products | - |
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| infructescence | (noun) the fruiting stage of the inflorescence | - |
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| inherence | (noun) the state of inhering; the state of being a fixed characteristic | Synonyms: inherency |
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| inheritance | (noun) hereditary succession to a title or an office or property | Synonyms: heritage |
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| (noun) any attribute or immaterial possession that is inherited from ancestors | Synonyms: heritage |
| (noun) (genetics) attributes acquired via biological heredity from the parents | Synonyms: hereditary pattern |
| (noun) that which is inherited; a title or property or estate that passes by law to the heir on the death of the owner | Synonyms: heritage |
| innocence | (noun) the quality of innocent naivete | Synonyms: artlessness, ingenuousness, naturalness |
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| (noun) a state or condition of being innocent of a specific crime or offense | - |
| (noun) the state of being unsullied by sin or moral wrong; lacking a knowledge of evil | Synonyms: pureness, purity, sinlessness, whiteness |
| insentience | (noun) lacking consciousness or ability to perceive sensations | - |
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| insignificance | (noun) the quality of having little or no significance | - |
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| insincere | (adjective) lacking sincerity | - |
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| insincerely | (adverb) without sincerity | - |
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| insincerity | (noun) the quality of not being open or truthful; deceitful or hypocritical | Synonyms: falseness, hollowness |
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| insistence | (noun) the act of insisting on something | Synonyms: insistency |
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| (noun) continual and persistent demands | Synonyms: insisting |
| (noun) the state of demanding notice or attention | Synonyms: imperativeness, insistency, press, pressure |
| insolence | (noun) an offensive disrespectful impudent act | - |
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| (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impertinence, impudence |
| insouciance | (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, lightheartedness, lightsomeness |
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| instance | (noun) an item of information that is typical of a class or group | Synonyms: example, illustration, representative |
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| (noun) an occurrence of something | Synonyms: case, example |
| (verb) clarify by giving an example of | Synonyms: exemplify, illustrate |
| insurance | (noun) written contract or certificate of insurance | Synonyms: insurance policy, policy |
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| (noun) promise of reimbursement in the case of loss; paid to people or companies so concerned about hazards that they have made prepayments to an insurance company | - |
| (noun) protection against future loss | Synonyms: indemnity |
| insurgence | (noun) an organized rebellion aimed at overthrowing a constituted government through the use of subversion and armed conflict | Synonyms: insurgency |
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| intelligence | (noun) the operation of gathering information about an enemy | Synonyms: intelligence activity, intelligence operation |
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| (noun) the ability to comprehend; to understand and profit from experience | - |
| (noun) information about recent and important events | Synonyms: news, tidings, word |
| (noun) secret information about an enemy (or potential enemy) | Synonyms: intelligence information |
| (noun) a unit responsible for gathering and interpreting information about an enemy | Synonyms: intelligence agency, intelligence service |
| intemperance | (noun) excess in action and immoderate indulgence of bodily appetites, especially in passion or indulgence | Synonyms: intemperateness, self-indulgence |
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| (noun) consumption of alcoholic drinks | Synonyms: intemperateness |
| (noun) the quality of being intemperate | - |
| interdependence | (noun) a reciprocal relation between interdependent entities (objects or individuals or groups) | Synonyms: interdependency, mutuality |
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| interference | (noun) the act of hindering or obstructing or impeding | Synonyms: hinderance, hindrance |
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| (noun) (American football) blocking a player's path with your body | - |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, preventative, preventive |
| (noun) a policy of intervening in the affairs of other countries | Synonyms: intervention |
| (noun) electrical or acoustic activity that can disturb communication | Synonyms: disturbance, noise |
| intermittence | (noun) the quality of being intermittent; subject to interruption or periodic stopping | Synonyms: intermittency |
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| intolerance | (noun) impatience with annoyances | - |
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| (noun) unwillingness to recognize and respect differences in opinions or beliefs | - |
| intransigence | (noun) the trait of being intransigent; stubbornly refusing to compromise | Synonyms: intransigency |
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| intumescence | (noun) the increase in volume of certain substances when they are heated (often accompanied by release of water) | Synonyms: intumescency, swelling |
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| (noun) swelling up with blood or other fluids (as with congestion) | Synonyms: intumescency |
| invariance | (noun) the quality of being resistant to variation | Synonyms: invariability, invariableness |
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| (noun) the nature of a quantity or property or function that remains unchanged when a given transformation is applied to it | - |
| iridescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: opalescence |
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| irrelevance | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevancy |
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| irreverence | (noun) a disrespectful act | Synonyms: violation |
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| (noun) an irreverent mental attitude | - |
| issuance | (noun) the act of providing an item for general use or for official purposes (usually in quantity) | Synonyms: issue, issuing |
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| jounce | (noun) a sudden jarring impact | Synonyms: jar, jolt, shock |
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| (verb) move up and down repeatedly | Synonyms: bounce |
| jubilance | (noun) a feeling of extreme joy | Synonyms: exultation, jubilancy, jubilation |
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| jurisprudence | (noun) the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do | Synonyms: law, legal philosophy |
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| (noun) the collection of rules imposed by authority | Synonyms: law |
| juvenescence | (noun) the process of growing into a youth | - |
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| lance | (noun) a long pointed rod used as a tool or weapon | Synonyms: shaft, spear |
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| (noun) an implement with a shaft and barbed point used for catching fish | Synonyms: fishgig, fizgig, gig, spear |
| (noun) a surgical knife with a pointed double-edged blade; used for punctures and small incisions | Synonyms: lancet |
| (verb) open by piercing with a lancet | - |
| (verb) pierce with a lance, as in a knights' fight | - |
| (verb) move quickly, as if by cutting one's way | - |
| lancelet | (noun) small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates | Synonyms: amphioxus |
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| lancelike | (adjective) (of a leaf shape) shaped like a lance head; narrow and tapering to a pointed apex | Synonyms: lanceolate |
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| lanceolate | (adjective) (of a leaf shape) shaped like a lance head; narrow and tapering to a pointed apex | Synonyms: lancelike |
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| lancer | (noun) (formerly) a cavalryman armed with a lance | - |
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| lancers | (noun) a quadrille for 8 or 16 couples | - |
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| lancet | (noun) a surgical knife with a pointed double-edged blade; used for punctures and small incisions | Synonyms: lance |
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| (noun) an acutely pointed Gothic arch, like a lance | Synonyms: lancet arch |
| lancetfish | (noun) large elongate scaleless oceanic fishes with sharp teeth and a long dorsal fin that resembles a sail | Synonyms: lancet fish, wolffish |
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| lancewood | (noun) source of most of the lancewood of commerce | Synonyms: lancewood tree, Oxandra lanceolata |
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| (noun) durable straight-grained wood of the lacewood tree; used for building and cabinetwork and tools | - |
| launce | (noun) very small silvery eellike schooling fishes that burrow into sandy beaches | Synonyms: sand eel, sand lance, sand launce |
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| lenience | (noun) lightening a penalty or excusing from a chore by judges or parents or teachers | Synonyms: leniency |
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| (noun) mercifulness as a consequence of being lenient or tolerant | Synonyms: leniency, lenity, mildness |
| (noun) a disposition to yield to the wishes of someone | Synonyms: indulgence, leniency |
| leukoencephalitis | (noun) inflammation of the white matter of the brain | - |
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| licence | (noun) a legal document giving official permission to do something | Synonyms: license, permit |
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| (noun) freedom to deviate deliberately from normally applicable rules or practices (especially in behavior or speech) | Synonyms: license |
| (noun) excessive freedom; lack of due restraint | Synonyms: license |
| (verb) authorize officially | Synonyms: certify, license |
| licenced | (adjective) given official approval to act | Synonyms: accredited, commissioned, licensed |
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| lithomancer | (noun) one who practices lithomancy | - |
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| luminance | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminosity, luminousness |
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| luminescence | (noun) light from nonthermal sources | Synonyms: glow |
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| (noun) light not due to incandescence; occurs at low temperatures | - |
| luxuriance | (noun) the property of being lush and abundant and a pleasure to the senses | Synonyms: lushness, voluptuousness |
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| macrencephalic | (adjective) having a large brain case | Synonyms: macrencephalous |
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| macrencephalous | (adjective) having a large brain case | Synonyms: macrencephalic |
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| macrencephaly | (noun) an abnormally large braincase | - |
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| magnificence | (noun) the quality of being magnificent or splendid or grand | Synonyms: brilliance, grandeur, grandness, splendor, splendour |
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| (noun) splendid or imposing in size or appearance | Synonyms: grandness, impressiveness, richness |
| magniloquence | (noun) high-flown style; excessive use of verbal ornamentation | Synonyms: grandiloquence, grandiosity, ornateness, rhetoric |
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| maintenance | (noun) activity involved in maintaining something in good working order | Synonyms: care, upkeep |
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| (noun) the act of sustaining life by food or providing a means of subsistence | Synonyms: sustainment, sustenance, sustentation, upkeep |
| (noun) the unauthorized interference in a legal action by a person having no interest in it (as by helping one party with money or otherwise to continue the action) so as to obstruct justice or promote unnecessary litigation or unsettle the peace of the community | Synonyms: criminal maintenance |
| (noun) means of maintenance of a family or group | - |
| (noun) court-ordered support paid by one spouse to another after they are separated | Synonyms: alimony |
| maleficence | (noun) the quality or nature of being harmful or evil | Synonyms: balefulness, mischief |
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| (noun) doing or causing evil | - |