| infallibility | (noun) the quality of never making an error | - |
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| infallible | (adjective) incapable of failure or error | - |
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| infamous | (adjective) known widely and usually unfavorably | Synonyms: ill-famed, notorious |
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| infamy | (noun) a state of extreme dishonor | Synonyms: opprobrium |
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| (noun) evil fame or public reputation | - |
| infancy | (noun) the earliest state of immaturity | Synonyms: babyhood |
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| (noun) the early stage of growth or development | Synonyms: babyhood, early childhood |
| infant | (noun) a very young child (birth to 1 year) who has not yet begun to walk or talk | Synonyms: babe, baby |
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| infanticide | (noun) murdering an infant | - |
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| (noun) a person who murders an infant | - |
| infantile | (adjective) of or relating to infants or infancy | - |
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| (adjective) indicating a lack of maturity | Synonyms: childish |
| (adjective) being or befitting or characteristic of an infant | - |
| infantilism | (noun) infantile behavior in mature persons | - |
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| (noun) an abnormal condition in which an older child or adult retains infantile characteristics | - |
| infantry | (noun) an army unit consisting of soldiers who fight on foot | Synonyms: foot |
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| infantryman | (noun) fights on foot with small arms | Synonyms: foot soldier, footslogger, marcher |
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| infarct | (noun) localized necrosis resulting from obstruction of the blood supply | Synonyms: infarction |
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| infarction | (noun) localized necrosis resulting from obstruction of the blood supply | Synonyms: infarct |
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| infatuate | (verb) arouse unreasoning love or passion in and cause to behave in an irrational way | - |
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| infatuated | (adjective) marked by foolish or unreasoning fondness | Synonyms: enamored, in love, potty, smitten, soft on, taken with |
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| infatuation | (noun) an object of extravagant short-lived passion | - |
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| (noun) a foolish and usually extravagant passion or love or admiration | - |
| (noun) temporary love of an adolescent | Synonyms: calf love, crush, puppy love |
| infeasibility | (noun) the quality of not being doable | Synonyms: unfeasibility |
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| infeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, unfeasible, unworkable |
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| infect | (verb) contaminate with a disease or microorganism | Synonyms: taint |
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| (verb) communicate a disease to | - |
| (verb) affect in a contagious way | - |
| (verb) corrupt with ideas or an ideology | - |
| infected | (adjective) containing or resulting from disease-causing organisms | Synonyms: septic |
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| infection | (noun) moral corruption or contamination | - |
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| (noun) (international law) illegality that taints or contaminates a ship or cargo rendering it liable to seizure | - |
| (noun) the communication of an attitude or emotional state among a number of people | Synonyms: contagion |
| (noun) an incident in which an infectious disease is transmitted | Synonyms: contagion, transmission |
| (noun) (medicine) the invasion of the body by pathogenic microorganisms and their multiplication which can lead to tissue damage and disease | - |
| (noun) (phonetics) the alteration of a speech sound under the influence of a neighboring sound | - |
| (noun) the pathological state resulting from the invasion of the body by pathogenic microorganisms | - |
| infectious | (adjective) easily spread | - |
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| (adjective) of or relating to infection | - |
| (adjective) caused by infection or capable of causing infection | Synonyms: infective |
| infectiously | (adverb) in a contagious manner | Synonyms: contagiously |
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| infective | (adjective) caused by infection or capable of causing infection | Synonyms: infectious |
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| (adjective) able to cause disease | Synonyms: morbific, pathogenic |
| infelicitous | (adjective) not appropriate in application; defective | - |
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| (adjective) marked by or producing unhappiness | Synonyms: unhappy |
| infelicitously | (adverb) in an infelicitous manner | - |
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| infelicity | (noun) inappropriate and unpleasing manner or style (especially manner or style of expression) | - |
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| infer | (verb) reason by deduction; establish by deduction | Synonyms: deduce, deduct, derive |
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| (verb) believe to be the case | Synonyms: understand |
| (verb) guess correctly; solve by guessing | Synonyms: guess |
| (verb) conclude by reasoning; in logic | Synonyms: deduce |
| (verb) draw from specific cases for more general cases | Synonyms: extrapolate, generalise, generalize |
| 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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| inferential | (adjective) relating to or having the nature of illation or inference | Synonyms: illative |
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| (adjective) derived or capable of being derived by inference | - |
| (adjective) based on interpretation; not directly expressed | - |
| (adjective) of reasoning; proceeding from general premisses to a necessary and specific conclusion | - |
| (adjective) resembling or dependent on or arrived at by inference | Synonyms: illative |
| inferior | (adjective) written or printed below and to one side of another character | Synonyms: subscript |
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| (adjective) of or characteristic of low rank or importance | - |
| (adjective) of low or inferior quality | - |
| (adjective) having an orbit between the sun and the Earth's orbit | - |
| (adjective) lower than a given reference point | - |
| (adjective) falling short of some prescribed norm | Synonyms: deficient, substandard |
| (noun) a character or symbol set or printed or written beneath or slightly below and to the side of another character | Synonyms: subscript |
| (noun) one of lesser rank or station or quality | - |
| inferiority | (noun) an inferior quality | Synonyms: low quality |
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| (noun) the quality of being a competitive disadvantage | Synonyms: unfavorable position |
| (noun) the state of being inferior | Synonyms: lower rank, lower status |
| infernal | (adjective) being of the underworld | - |
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| (adjective) characteristic of or resembling Hell | - |
| (adjective) of or pertaining to or characteristic of a very uncontrolled and intense fire | - |
| (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blasted, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned |
| (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, fiendish, hellish, satanic, unholy |
| (noun) an inhabitant of Hell | - |
| infernally | (adverb) diabolically | Synonyms: hellishly |
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| inferno | (noun) a very intense and uncontrolled fire | Synonyms: conflagration |
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| (noun) any place of pain and turmoil | Synonyms: hell, hell on earth, hellhole, snake pit, the pits |
| infertile | (adjective) incapable of reproducing | Synonyms: sterile, unfertile |
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| infertility | (noun) the state of being unable to produce offspring; in a woman it is an inability to conceive; in a man it is an inability to impregnate | Synonyms: sterility |
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| infest | (verb) invade in great numbers | Synonyms: overrun |
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| (verb) live on or in a host, as of parasites | - |
| (verb) occupy in large numbers or live on a host | Synonyms: invade, overrun |
| infestation | (noun) a swarm of insects that attack plants | Synonyms: plague |
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| (noun) the state of being invaded or overrun by parasites | - |
| infidel | (noun) a person who does not acknowledge your god | Synonyms: gentile, heathen, pagan |
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| infidelity | (noun) the quality of being unfaithful | Synonyms: unfaithfulness |
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| infield | (noun) the area of a baseball field that is enclosed by 3 bases and home plate | Synonyms: baseball diamond, diamond |
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| infielder | (noun) (baseball) a person who plays a position in the infield | - |
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| infighting | (noun) boxing at close quarters | - |
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| (noun) conflict between members of the same organization (usually concealed from outsiders) | - |
| infiltrate | (verb) pass through an enemy line; in a military conflict | Synonyms: pass through |
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| (verb) cause (a liquid) to enter by penetrating the interstices | - |
| (verb) pass into or through by filtering or permeating | - |
| (verb) enter a group or organization in order to spy on the members | Synonyms: penetrate |
| infiltration | (noun) a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection) | - |
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| (noun) the slow passage of a liquid through a filtering medium | Synonyms: percolation |
| infiltrator | (noun) an intruder (as troops) with hostile intent | - |
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| (noun) someone who takes up a position surreptitiously for the purpose of espionage | - |
| infinite | (adjective) having no limits or boundaries in time or space or extent or magnitude | - |
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| (adjective) (of verbs) not having tense, person, or number (as a participle or gerund or infinitive) | Synonyms: non-finite, nonfinite |
| (adjective) total and all-embracing | - |
| (adjective) too numerous to be counted | Synonyms: countless, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
| (noun) the unlimited expanse in which everything is located | Synonyms: space |
| infinitely | (adverb) continuing forever without end | Synonyms: endlessly |
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| (adverb) without bounds | Synonyms: boundlessly, immeasurably |
| infiniteness | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infinitude, limitlessness, unboundedness |
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| infinitesimal | (adjective) infinitely or immeasurably small | Synonyms: minute |
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| (noun) (mathematics) a variable that has zero as its limit | - |
| infinitival | (adjective) relating to or formed with the infinitive | - |
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| infinitive | (noun) the uninflected form of the verb | - |
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| infinitude | (noun) the quality of being infinite; without bound or limit | Synonyms: boundlessness, infiniteness, limitlessness, unboundedness |
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| (noun) an infinite quantity | - |
| infinity | (noun) time without end | Synonyms: eternity |
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| infirm | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, decrepit, feeble, rickety, sapless, weak, weakly |
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| (adjective) lacking firmness of will or character or purpose | - |
| infirmary | (noun) a health facility where patients receive treatment | Synonyms: hospital |
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| infirmity | (noun) the state of being weak in health or body (especially from old age) | Synonyms: debility, feebleness, frailness, frailty, valetudinarianism |
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| infix | (noun) an affix that is inserted inside the word | - |
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| (verb) attach a morpheme into a stem word | - |
| (verb) put or introduce into something | Synonyms: enter, insert, introduce |
| inflame | (verb) become inflamed; get sore | - |
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| (verb) cause inflammation in | - |
| (verb) arouse or excite feelings and passions | Synonyms: fire up, heat, ignite, stir up, wake |
| (verb) cause to start burning | Synonyms: conflagrate, enkindle, kindle |
| (verb) catch fire | Synonyms: kindle |
| inflamed | (adjective) adorned with tongues of flame | - |
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| (adjective) lighted with red light as if with flames | Synonyms: ablaze, reddened |
| (adjective) resulting from inflammation; hot and swollen and reddened | - |
| inflaming | (noun) arousal to violent emotion | Synonyms: inflammation |
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| inflammability | (noun) the quality of being easily ignited and burning rapidly | Synonyms: flammability |
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| inflammable | (adjective) easily ignited | Synonyms: flammable |
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| inflammation | (noun) arousal to violent emotion | Synonyms: inflaming |
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| (noun) the act of setting something on fire | Synonyms: firing, ignition, kindling, lighting |
| (noun) a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat | Synonyms: redness, rubor |
| (noun) the state of being emotionally aroused and worked up | Synonyms: excitation, excitement, fervor, fervour |
| inflammatory | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, instigative, rabble-rousing, seditious |
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| (adjective) characterized or caused by inflammation | - |
| inflatable | (adjective) designed to be filled with air or gas | - |
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| inflate | (verb) fill with gas or air | Synonyms: blow up |
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| (verb) exaggerate or make bigger | Synonyms: amplify, blow up, expand |
| (verb) become inflated | Synonyms: balloon, billow |
| (verb) increase the amount or availability of, creating a rise in value | - |
| (verb) cause prices to rise by increasing the available currency or credit | - |
| inflated | (adjective) pretentious (especially with regard to language or ideals) | Synonyms: high-flown, high-sounding |
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| (adjective) enlarged beyond truth or reasonableness | Synonyms: hyperbolic |
| inflater | (noun) an air pump operated by hand to inflate something (as a tire) | Synonyms: inflator |
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| inflation | (noun) the act of filling something with air | - |
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| (noun) lack of elegance as a consequence of being pompous and puffed up with vanity | Synonyms: ostentation, ostentatiousness, pomposity, pompousness, pretentiousness, puffiness, splashiness |
| (noun) (cosmology) a brief exponential expansion of the universe (faster than the speed of light) postulated to have occurred shortly after the big bang | - |
| (noun) a general and progressive increase in prices | Synonyms: rising prices |
| inflationary | (adjective) associated with or tending to cause increases in inflation | - |
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| inflator | (noun) an air pump operated by hand to inflate something (as a tire) | Synonyms: inflater |
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| inflect | (verb) vary the pitch of one's speech | Synonyms: modulate, tone |
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| (verb) change the form of a word in accordance as required by the grammatical rules of the language | - |
| inflected | (adjective) (of the voice) altered in tone or pitch | - |
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| (adjective) showing alteration in form (especially by the addition of affixes) | - |
| inflection | (noun) the patterns of stress and intonation in a language | Synonyms: prosody |
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| (noun) a manner of speaking in which the loudness or pitch or tone of the voice is modified | Synonyms: modulation |
| (noun) deviation from a straight or normal course | Synonyms: flection, flexion |
| (noun) a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function | Synonyms: inflexion |
| inflectional | (adjective) characterized by inflections indicating grammatical distinctions | - |
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| inflexibility | (noun) the quality of being rigid and rigorously severe | Synonyms: rigidity, rigidness |
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| (noun) a lack of physical flexibility | Synonyms: inflexibleness |
| inflexible | (adjective) resistant to being bent | - |
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| (adjective) incapable of change | - |
| (adjective) not making concessions | Synonyms: sturdy, uncompromising |
| (adjective) incapable of adapting or changing to meet circumstances | Synonyms: rigid, unbending |
| inflexibleness | (noun) a lack of physical flexibility | Synonyms: inflexibility |
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| inflexibly | (adverb) in an inflexible manner | - |
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| inflexion | (noun) a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function | Synonyms: inflection |
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| inflict | (verb) impose something unpleasant | Synonyms: bring down, impose, visit |
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| infliction | (noun) the act of imposing something (as a tax or an embargo) | Synonyms: imposition |
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| (noun) an act causing pain or damage | - |
| (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, bother, botheration, nuisance, pain, pain in the ass, pain in the neck |
| infliximab | (noun) an anti-TNF compound (trade name Remicade) consisting of an antibody directed against TNF; it is given intravenously at one-month to three-month intervals; used in treatment of regional enteritis and rheumatoid arthritis | Synonyms: Remicade |
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| (noun) a monoclonal antibody (trade name Remicade) used to treat Crohn's disease and rheumatoid arthritis; administered by infusion; use and dosage must be determined by a physician | Synonyms: Remicade |
| 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 |
| inflow | (noun) the process of flowing in | Synonyms: influx |
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| inflowing | (adjective) flowing inward | Synonyms: influent |
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| 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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| influent | (adjective) flowing inward | Synonyms: inflowing |
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| influential | (adjective) having or exercising influence or power | - |
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| influentially | (adverb) exerting influence | - |
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| influenza | (noun) an acute febrile highly contagious viral disease | Synonyms: flu, grippe |
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| influx | (noun) the process of flowing in | Synonyms: inflow |
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| info | (noun) a message received and understood | Synonyms: information |
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| infolding | (noun) the folding in of an outer layer so as to form a pocket in the surface | Synonyms: introversion, intussusception, invagination |
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| infomercial | (noun) a television commercial presented in the form of a short documentary | Synonyms: informercial |
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| inform | (verb) give character or essence to | - |
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| (verb) impart knowledge of some fact, state of affairs, or event to | - |
| (verb) act as an informer | - |
| informal | (adjective) not formal | - |
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| (adjective) used of spoken and written language | - |
| (adjective) having or fostering a warm or friendly and informal atmosphere | Synonyms: cosy, cozy, intimate |
| (adjective) not officially recognized or controlled | Synonyms: loose |