| ira | (noun) belligerence aroused by a real or supposed wrong (personified as one of the deadly sins) | Synonyms: anger, ire, wrath |
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| irascibility | (noun) a feeling of resentful anger | Synonyms: quick temper, short temper, spleen |
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| irascible | (adjective) characterized by anger | Synonyms: choleric |
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| (adjective) quickly aroused to anger | Synonyms: choleric, hot-tempered, hotheaded, quick-tempered, short-tempered |
| irate | (adjective) feeling or showing extreme anger | Synonyms: ireful |
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| irately | (adverb) in an irate manner | - |
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| ire | (noun) belligerence aroused by a real or supposed wrong (personified as one of the deadly sins) | Synonyms: anger, ira, wrath |
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| (noun) a strong emotion; a feeling that is oriented toward some real or supposed grievance | Synonyms: anger, choler |
| ireful | (adjective) feeling or showing extreme anger | Synonyms: irate |
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| irenic | (adjective) conducive to peace | - |
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| iridaceous | (adjective) of or pertaining to or characteristic of plants of the family Iridaceae | - |
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| iridectomy | (noun) an eye operation that treats closed-angle glaucoma by surgical removal of part of the iris of the eye | - |
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| iridesce | (verb) be iridescent | - |
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| 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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| iridescent | (adjective) having a play of lustrous rainbow colors | Synonyms: nacreous, opalescent, opaline, pearlescent |
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| (adjective) varying in color when seen in different lights or from different angles | Synonyms: changeable, chatoyant, shot |
| iridic | (adjective) of or relating to the iris of the eye | - |
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| (adjective) of or containing iridium | - |
| iridium | (noun) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium | Synonyms: atomic number 77, Ir |
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| iridocyclitis | (noun) inflammation of the iris and ciliary body of the eye | - |
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| iridokeratitis | (noun) inflammation of the iris and cornea of the eye | - |
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| iridoncus | (noun) swelling of the iris of the eye | - |
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| iridosmine | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: osmiridium |
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| iridotomy | (noun) a surgical procedure that makes an incision in the iris of the eye in order to enlarge the pupil or to treat closed-angle glaucoma | - |
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| iris | (noun) diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening | Synonyms: iris diaphragm |
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| (noun) muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye | - |
| (noun) plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals | Synonyms: flag, fleur-de-lis, sword lily |
| iritic | (adjective) of or relating to located near the iris of the eye | - |
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| iritis | (noun) inflammation of the iris | - |
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| irk | (verb) irritate or vex | Synonyms: gall |
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| irksome | (adjective) so lacking in interest as to cause mental weariness | Synonyms: boring, deadening, dull, ho-hum, slow, tedious, tiresome, wearisome |
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| iron | (adjective) extremely robust | Synonyms: cast-iron |
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| (noun) home appliance consisting of a flat metal base that is heated and used to smooth cloth | Synonyms: smoothing iron |
| (noun) a golf club that has a relatively narrow metal head | - |
| (noun) implement used to brand live stock | Synonyms: branding iron |
| (noun) a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood | Synonyms: atomic number 26, Fe |
| (verb) press and smooth with a heated iron | Synonyms: iron out, press |
| ironclad | (adjective) inflexibly entrenched and unchangeable | Synonyms: brassbound |
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| (adjective) sheathed in iron plates for protection | - |
| (adjective) without flaws or loopholes | Synonyms: bulletproof, unassailable, unshakable, watertight |
| (noun) a wooden warship of the 19th century that is plated with iron or steel armor | - |
| ironed | (adjective) (of linens or clothes) smoothed with a hot iron | - |
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| ironic | (adjective) humorously sarcastic or mocking | Synonyms: dry, ironical, wry |
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| (adjective) characterized by often poignant difference or incongruity between what is expected and what actually is | Synonyms: ironical |
| ironical | (adjective) humorously sarcastic or mocking | Synonyms: dry, ironic, wry |
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| (adjective) characterized by often poignant difference or incongruity between what is expected and what actually is | Synonyms: ironic |
| ironically | (adverb) in an ironic manner | - |
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| (adverb) contrary to plan or expectation | - |
| ironing | (noun) the work of using heat to smooth washed clothes in order to remove any wrinkles | - |
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| (noun) garments (clothes or linens) that are to be (or have been) ironed | - |
| ironist | (noun) a humorist who uses ridicule and irony and sarcasm | Synonyms: ridiculer, satirist |
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| ironlike | (adjective) exhibiting strength or hardness like that of iron | - |
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| ironman | (noun) a strong man of exceptional physical endurance | Synonyms: iron man |
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| ironmonger | (noun) a store selling hardware | Synonyms: hardware store, ironmonger's shop |
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| (noun) someone who sells hardware | Synonyms: hardwareman |
| ironmongery | (noun) the merchandise that is sold in an ironmonger's shop | - |
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| irons | (noun) metal shackles; for hands or legs | Synonyms: chains |
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| ironshod | (adjective) shod or cased with iron | - |
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| ironside | (noun) a man of great strength or bravery | - |
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| ironware | (noun) instrumentalities (tools or implements) made of metal | Synonyms: hardware |
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| ironweed | (noun) any of various plants of the genus Vernonia of tropical and warm regions of especially North America that take their name from their loose heads of purple to rose flowers that quickly take on a rusty hue | Synonyms: vernonia |
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| ironwood | (noun) a small slow-growing deciduous tree of northern Iran having a low domed shape | Synonyms: iron-tree, iron tree, ironwood tree |
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| (noun) medium-sized hop hornbeam of eastern North America | Synonyms: Eastern hop hornbeam, ironwood tree, Ostrya virginiana |
| (noun) handsome East Indian evergreen tree often planted as an ornamental for its fragrant white flowers that yield a perfume; source of very heavy hardwood used for railroad ties | Synonyms: ironwood tree, Mesua ferrea, rose chestnut |
| (noun) exceptionally tough or hard wood of any of a number of ironwood trees | - |
| ironwork | (noun) work made of iron (gratings or rails or railings etc) | - |
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| ironworker | (noun) a person who makes articles of iron | - |
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| ironworks | (noun) the workplace where iron is smelted or where iron goods are made | - |
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| irony | (noun) incongruity between what might be expected and what actually occurs | - |
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| (noun) a trope that involves incongruity between what is expected and what occurs | - |
| (noun) witty language used to convey insults or scorn | Synonyms: caustic remark, sarcasm, satire |
| irradiate | (verb) expose to radiation | Synonyms: ray |
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| (verb) cast rays of light upon | - |
| (verb) give spiritual insight to; in religion | Synonyms: enlighten |
| irradiation | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, radiation, radiation therapy, radiotherapy |
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| (noun) the apparent enlargement of a bright object when viewed against a dark background | - |
| (noun) (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus | - |
| (noun) (physiology) the spread of sensory neural impulses in the cortex | - |
| (noun) a column of light (as from a beacon) | Synonyms: beam, beam of light, light beam, ray, ray of light, shaft, shaft of light |
| (noun) the condition of being exposed to radiation | - |
| irrational | (adjective) not consistent with or using reason | - |
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| (adjective) real but not expressible as the quotient of two integers | - |
| (noun) a real number that cannot be expressed as a rational number | Synonyms: irrational number |
| irrationality | (noun) the state of being irrational; lacking powers of understanding | Synonyms: unreason |
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| irrationally | (adverb) in an irrational manner | - |
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| irreality | (noun) the state of being insubstantial or imaginary; not existing objectively or in fact | Synonyms: unreality |
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| irreclaimable | (adjective) insusceptible of reform | Synonyms: irredeemable, unredeemable, unreformable |
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| irreconcilable | (adjective) impossible to reconcile | Synonyms: unreconcilable |
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| irrecoverable | (adjective) incapable of being recovered or regained | Synonyms: unrecoverable |
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| irredeemable | (adjective) (of paper money) not convertible into coin at the pleasure of the holder | - |
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| (adjective) insusceptible of reform | Synonyms: irreclaimable, unredeemable, unreformable |
| irredenta | (noun) a region that is related ethnically or historically to one country but is controlled politically by another | Synonyms: irridenta |
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| irredentism | (noun) the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related | Synonyms: irridentism |
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| irredentist | (noun) an advocate of irredentism | Synonyms: irridentist |
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| irreducible | (adjective) incapable of being made smaller or simpler | - |
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| irrefutable | (adjective) impossible to deny or disprove | Synonyms: incontrovertible, positive |
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| irregardless | (adverb) regardless; a combination of irrespective and regardless sometimes used humorously | - |
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| irregular | (adjective) contrary to rule or accepted order or general practice | - |
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| (adjective) (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement | - |
| (adjective) (used of the military) not belonging to or engaged in by regular army forces | - |
| (adjective) deviating from normal expectations; somewhat odd, strange, or abnormal | Synonyms: atypical |
| (adjective) failing to meet a standard of manufacture due to an imperfection | - |
| (adjective) lacking continuity or regularity | Synonyms: temporary |
| (adjective) not occurring at a regular rate or fixed intervals | Synonyms: unpredictable |
| (adjective) independent in behavior or thought | Synonyms: maverick, unorthodox |
| (adjective) (of a surface or shape); not level or flat or symmetrical | - |
| (noun) merchandise that has imperfections; usually sold at a reduced price without the brand name | Synonyms: second |
| (noun) a member of an irregular armed force that fights a stronger force by sabotage and harassment | Synonyms: guerilla, guerrilla, insurgent |
| irregularity | (noun) behavior that breaches the rule or etiquette or custom or morality | Synonyms: abnormality |
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| (noun) not characterized by a fixed principle or rate; at irregular intervals | Synonyms: unregularity |
| (noun) an irregular asymmetry in shape; an irregular spatial pattern | Synonyms: geometrical irregularity |
| (noun) irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis | Synonyms: constipation |
| irregularly | (adverb) in an inconstant manner, not according to fixed rate or schedule | Synonyms: on an irregular basis |
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| (adverb) at an uneven rate | - |
| (adverb) having an irregular form | - |
| irrelevance | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevancy |
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| irrelevancy | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevance |
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| irrelevant | (adjective) having no bearing on or connection with the subject at issue | - |
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| irrelevantly | (adverb) in an irrelevant manner | - |
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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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| irremediable | (adjective) impossible to remedy or correct or redress | - |
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| irremovability | (noun) the quality or state of not being removable. | - |
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| irremovable | (adjective) incapable of being removed or away or dismiss | - |
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| irreparable | (adjective) impossible to repair, rectify, or amend | - |
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| irreparably | (adverb) in an irreparable manner or to an irreparable degree | - |
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| irreplaceable | (adjective) impossible to replace | Synonyms: unreplaceable |
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| irreplaceableness | (noun) the quality of being irreplaceable | - |
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| irrepressibility | (noun) irrepressible liveliness and good spirit | Synonyms: buoyancy |
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| irrepressible | (adjective) impossible to repress or control | Synonyms: uncontrollable |
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| irreproachable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, unimpeachable |
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| irreproachably | (adverb) in an irreproachable and blameless manner | Synonyms: blamelessly |
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| irreproducibility | (noun) the quality of being unreproducible | - |
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| irreproducible | (adjective) impossible to reproduce or duplicate | Synonyms: unreproducible |
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| irresistibility | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibleness |
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| irresistible | (adjective) impossible to resist; overpowering | Synonyms: resistless |
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| (adjective) overpoweringly attractive | - |
| irresistibleness | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibility |
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| irresistibly | (adverb) incapable of being resisted | Synonyms: overpoweringly, overwhelmingly |
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| irresolute | (adjective) uncertain how to act or proceed | - |
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| irresolutely | (adverb) lacking determination or decisiveness | - |
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| irresoluteness | (noun) the trait of being irresolute; lacking firmness of purpose | Synonyms: irresolution |
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| irresolution | (noun) the trait of being irresolute; lacking firmness of purpose | Synonyms: irresoluteness |
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| (noun) doubt concerning two or more possible alternatives or courses of action | Synonyms: indecision, indecisiveness |
| irrespective | (adverb) in spite of everything; without regard to drawbacks | Synonyms: disregarding, disregardless, no matter, regardless |
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| irresponsibility | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibleness |
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| irresponsible | (adjective) showing lack of care for consequences | - |
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| irresponsibleness | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibility |
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| irresponsibly | (adverb) in an irresponsible manner | - |
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