| ignoramus | (noun) an ignorant person | Synonyms: know nothing, uneducated person |
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| ignorance | (noun) the lack of knowledge or education | - |
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| ignorant | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: unknowing, unknowledgeable, unwitting |
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| (adjective) uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field | Synonyms: illiterate |
| (adjective) uneducated in general; lacking knowledge or sophistication | Synonyms: nescient, unlearned, unlettered |
| ignorantly | (adverb) in ignorance; in an ignorant manner | - |
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| ignorantness | (noun) ignorance (especially of orthodox beliefs) | Synonyms: nescience, unknowing, unknowingness |
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| ignore | (verb) be ignorant of or in the dark about | - |
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| (verb) give little or no attention to | Synonyms: disregard, neglect |
| (verb) bar from attention or consideration | Synonyms: brush aside, brush off, discount, dismiss, disregard, push aside |
| (verb) refuse to acknowledge | Synonyms: cut, disregard, snub |
| (verb) fail to notice | - |
| ignored | (adjective) disregarded | Synonyms: neglected, unheeded |
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| iguana | (noun) large herbivorous tropical American arboreal lizards with a spiny crest along the back; used as human food in Central America and South America | Synonyms: common iguana, Iguana iguana |
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| iguanid | (noun) lizards of the New World and Madagascar and some Pacific islands; typically having a long tail and bright throat patch in males | Synonyms: iguanid lizard |
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| iguanodon | (noun) massive herbivorous bipedal dinosaur with a long heavy tail; common in Europe and northern Africa; early Cretaceous period | - |
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| immigrant | (noun) a person who comes to a country where they were not born in order to settle there | - |
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| immigrate | (verb) come into a new country and change residency | - |
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| (verb) migrate to a new environment | - |
| (verb) introduce or send as immigrants | - |
| immigration | (noun) migration into a place (especially migration to a country of which you are not a native in order to settle there) | Synonyms: in-migration |
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| (noun) the body of immigrants arriving during a specified interval | - |
| impetiginous | (adjective) of or relating to or having impetigo | - |
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| impetigo | (noun) a very contagious infection of the skin; common in children; localized redness develops into small blisters that gradually crust and erode | - |
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| incorrigible | (adjective) impervious to correction by punishment | - |
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| (adjective) difficult or impossible to manage or control | - |
| incorrigibly | (adverb) in an incorrigible manner | - |
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| indefatigability | (noun) tireless determination | Synonyms: indefatigableness, tirelessness |
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| indefatigable | (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: tireless, unflagging, unwearying |
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| indefatigableness | (noun) tireless determination | Synonyms: indefatigability, tirelessness |
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| indefatigably | (adverb) with indefatigable energy | Synonyms: inexhaustibly, tirelessly |
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| indigen | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, aborigine, indigene, native |
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| indigence | (noun) a state of extreme poverty or destitution | Synonyms: need, pauperism, pauperization, penury |
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| indigene | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, aborigine, indigen, native |
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| indigenous | (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, autochthonous, endemic |
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| indigenously | (adverb) in an indigenous manner | - |
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| indigenousness | (noun) nativeness by virtue of originating or occurring naturally (as in a particular place) | Synonyms: autochthony, endemism |
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| indigent | (adjective) poor enough to need help from others | Synonyms: destitute, impoverished, necessitous, needy, poverty-stricken |
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| indigestibility | (noun) the property of being difficult to digest | Synonyms: indigestibleness |
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| indigestible | (adjective) digested with difficulty | - |
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| indigestibleness | (noun) the property of being difficult to digest | Synonyms: indigestibility |
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| indigestion | (noun) a disorder of digestive function characterized by discomfort or heartburn or nausea | Synonyms: dyspepsia, stomach upset, upset stomach |
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| indignant | (adjective) angered at something unjust or wrong | Synonyms: incensed, outraged, umbrageous |
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| indignantly | (adverb) in an indignant manner | - |
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| indignation | (noun) a feeling of righteous anger | Synonyms: outrage |
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| indignity | (noun) an affront to one's dignity or self-esteem | - |
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| indigo | (adjective) having a color between blue and violet | - |
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| (noun) a blue-violet color | - |
| (noun) deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye | Synonyms: indigo plant, Indigofera tinctoria |
| (noun) a blue dye obtained from plants or made synthetically | Synonyms: anil, indigotin |
| indigotin | (noun) a blue dye obtained from plants or made synthetically | Synonyms: anil, indigo |
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| ineligibility | (noun) the quality or state of being ineligible | - |
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| ineligible | (adjective) not eligible | - |
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| (adjective) prohibited by official rules | - |
| infighting | (noun) boxing at close quarters | - |
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| (noun) conflict between members of the same organization (usually concealed from outsiders) | - |
| infrigidation | (noun) the process of cooling or freezing (e.g., food) for preservative purposes | Synonyms: refrigeration |
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| insight | (noun) grasping the inner nature of things intuitively | Synonyms: sixth sense |
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| (noun) the clear (and often sudden) understanding of a complex situation | Synonyms: brainstorm, brainwave |
| (noun) clear or deep perception of a situation | Synonyms: penetration |
| (noun) a feeling of understanding | Synonyms: perceptiveness, perceptivity |
| insightful | (adjective) exhibiting insight or clear and deep perception | - |
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| insightfulness | (noun) shrewdness shown by keen insight | Synonyms: acumen |
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| insignia | (noun) a badge worn to show official position | - |
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| insignificance | (noun) the quality of having little or no significance | - |
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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 |
| insignificantly | (adverb) not to a significant degree or amount | - |
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| (adverb) in an insignificant manner | - |
| instigant | (noun) someone who deliberately foments trouble | Synonyms: firebrand, inciter, instigator, provoker |
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| instigate | (verb) provoke or stir up | Synonyms: incite, set off, stir up |
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| (verb) serve as the inciting cause of | Synonyms: inspire, prompt |
| instigation | (noun) deliberate and intentional triggering (of trouble or discord) | Synonyms: fomentation |
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| (noun) the verbal act of urging on | Synonyms: abetment, abettal |
| instigative | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, inflammatory, rabble-rousing, seditious |
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| instigator | (noun) a person who initiates a course of action | Synonyms: initiator |
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| (noun) someone who deliberately foments trouble | Synonyms: firebrand, inciter, instigant, provoker |
| 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 |
| intelligent | (adjective) having the capacity for thought and reason especially to a high degree | - |
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| (adjective) endowed with the capacity to reason | Synonyms: reasoning, thinking |
| (adjective) exercising or showing good judgment | Synonyms: healthy, level-headed, levelheaded, sound |
| (adjective) possessing sound knowledge | Synonyms: well-informed |
| intelligently | (adverb) in an intelligent manner | - |
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| intelligentsia | (noun) an educated and intellectual elite | Synonyms: clerisy |
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| intelligibility | (noun) the quality of language that is comprehensible | - |
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| intelligible | (adjective) well articulated or enunciated, and loud enough to be heard distinctly | - |
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| (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, perceivable, understandable |
| intelligibly | (adverb) in an intelligible manner | Synonyms: clearly, understandably |
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| intertrigo | (noun) chafing between two skin surfaces that are in contact (as in the armpit or under the breasts or between the thighs) | - |
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| intransigence | (noun) the trait of being intransigent; stubbornly refusing to compromise | Synonyms: intransigency |
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| intransigency | (noun) the trait of being intransigent; stubbornly refusing to compromise | Synonyms: intransigence |
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| intransigent | (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, adamantine, inexorable |
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| intrigue | (noun) a crafty and involved plot to achieve your (usually sinister) ends | Synonyms: machination |
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| (noun) a clandestine love affair | - |
| (verb) form intrigues (for) in an underhand manner | Synonyms: connive, scheme |
| (verb) cause to be interested or curious | Synonyms: fascinate |
| intriguer | (noun) a person who devises plots or intrigues | Synonyms: designer |
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| intriguing | (adjective) capable of arousing interest or curiosity | - |
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| (adjective) disturbingly provocative | Synonyms: challenging |
| inveigh | (verb) complain bitterly | Synonyms: rail |
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| (verb) speak against in an impassioned manner | Synonyms: declaim |
| inveigle | (verb) influence or urge by gentle urging, caressing, or flattering | Synonyms: blarney, cajole, coax, palaver, sweet-talk, wheedle |
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| investigate | (verb) investigate scientifically | Synonyms: look into |
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| (verb) conduct an inquiry or investigation of | Synonyms: enquire, inquire |
| investigating | (noun) the work of inquiring into something thoroughly and systematically | Synonyms: investigation |
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| investigation | (noun) the work of inquiring into something thoroughly and systematically | Synonyms: investigating |
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| (noun) an inquiry into unfamiliar or questionable activities | Synonyms: probe |
| investigative | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigatory |
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| investigator | (noun) someone who investigates | - |
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| (noun) a scientist who devotes himself to doing research | Synonyms: research worker, researcher |
| (noun) a police officer who investigates crimes | Synonyms: detective, police detective, tec |
| investigatory | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigative |
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| invigilate | (verb) watch over (students taking an exam, to prevent cheating) | Synonyms: proctor |
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| invigilation | (noun) keeping watch over examination candidates to prevent cheating | - |
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| invigilator | (noun) someone who watches examination candidates to prevent cheating | - |
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| invigorate | (verb) impart vigor, strength, or vitality to | Synonyms: reinvigorate |
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| (verb) make lively | Synonyms: animate, enliven, liven, liven up |
| (verb) give life or energy to | Synonyms: quicken |
| (verb) heighten or intensify | Synonyms: animate, enliven, exalt, inspire |
| invigorated | (adjective) with restored energy | Synonyms: fresh, refreshed, reinvigorated |
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| invigorating | (adjective) imparting strength and vitality | - |
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| invigoration | (noun) the activity of giving vitality and vigour to something | Synonyms: animation, vivification |
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| (noun) quality of being active or spirited or alive and vigorous | Synonyms: animation, brio, spiritedness, vivification |
| invigorator | (noun) an agent that gives or restores life or vigor | Synonyms: enlivener, quickener |
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| irreligion | (noun) the quality of not being devout | Synonyms: irreligiousness |
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| irreligionist | (noun) someone who is indifferent or hostile to religion | - |
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| irreligious | (adjective) hostile or indifferent to religion | - |
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| irreligiousness | (noun) the quality of not being devout | Synonyms: irreligion |
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| irrigate | (verb) supply with a constant flow or sprinkling of some liquid, for the purpose of cooling, cleansing, or disinfecting | - |
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| (verb) supply with water, as with channels or ditches or streams | Synonyms: water |
| irrigation | (noun) supplying dry land with water by means of ditches etc | - |
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| (noun) (medicine) cleaning a wound or body organ by flushing or washing out with water or a medicated solution | - |
| jacklight | (noun) a light used as a lure in hunting or fishing at night | - |
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| (verb) hunt with a jacklight | Synonyms: jack |
| jig | (noun) any of various old rustic dances involving kicking and leaping | - |
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| (noun) a device that holds a piece of machine work and guides the tools operating on it | - |
| (noun) a fisherman's lure with one or more hooks that is jerked up and down in the water | - |
| (noun) music in three-four time for dancing a jig | Synonyms: gigue |
| (verb) dance a quick dance with leaping and kicking motions | - |
| jigaboo | (noun) (ethnic slur) extremely offensive name for a Black person | Synonyms: nigga, nigger, nigra |
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| jigg | (verb) dancing in a style associated with the South Louisiana club scene | - |
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| jigger | (noun) larval mite that sucks the blood of vertebrates including human beings causing intense irritation | Synonyms: chigger, harvest mite, redbug |
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| (noun) a small glass adequate to hold a single swallow of whiskey | Synonyms: pony, shot glass |
| (noun) any small mast on a sailing vessel; especially the mizzenmast of a yawl | Synonyms: jiggermast |
| jiggered | (adjective) (British informal expletive) surprised | - |
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| jiggermast | (noun) any small mast on a sailing vessel; especially the mizzenmast of a yawl | Synonyms: jigger |
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| jiggle | (noun) a slight irregular shaking motion | Synonyms: joggle |
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| (verb) move to and fro | Synonyms: joggle, wiggle |
| jigsaw | (noun) fine-toothed power saw with a narrow blade; used to cut curved outlines | Synonyms: fretsaw, scroll saw |
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| (noun) a portable power saw with a reciprocating blade; can be used with a variety of blades depending on the application and kind of cut; generally have a plate that rides on the surface that is being cut | Synonyms: reciprocating saw, saber saw |
| knight | (noun) a chessman shaped to resemble the head of a horse; can move two squares horizontally and one vertically (or vice versa) | Synonyms: horse |
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| (noun) originally a person of noble birth trained to arms and chivalry; today in Great Britain a person honored by the sovereign for personal merit | - |
| (verb) raise (someone) to knighthood | Synonyms: dub |