| 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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| irretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: unretrievable |
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| irretrievably | (adverb) in an irretrievable manner | - |
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| irreverence | (noun) a disrespectful act | Synonyms: violation |
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| (noun) an irreverent mental attitude | - |
| irreverent | (adjective) showing lack of due respect or veneration | - |
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| (adjective) not revering god | Synonyms: godless |
| (adjective) characterized by a lightly pert and exuberant quality | Synonyms: impertinent, pert, saucy |
| irreverently | (adverb) without respect | - |
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| (adverb) in an irreverent manner | - |
| irreversibility | (noun) the quality of being irreversible (once done it cannot be changed) | - |
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| irreversible | (adjective) incapable of being reversed | - |
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| irreversibly | (adverb) in an irreversible manner | - |
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| irrevocability | (noun) The state or condition of being impossible to retract or reverse; finality. | - |
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| irrevocable | (adjective) incapable of being retracted or revoked | Synonyms: irrevokable |
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| irrevocably | (adverb) in an irrevocable manner | - |
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| irrevokable | (adjective) incapable of being retracted or revoked | Synonyms: irrevocable |
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| irridenta | (noun) a region that is related ethnically or historically to one country but is controlled politically by another | Synonyms: irredenta |
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| irridentism | (noun) the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related | Synonyms: irredentism |
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| irridentist | (noun) an advocate of irredentism | Synonyms: irredentist |
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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 | - |
| irritability | (noun) a disposition to exhibit uncontrolled anger | Synonyms: biliousness, peevishness, pettishness, snappishness, surliness, temper |
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| (noun) excessive sensitivity of an organ or body part | Synonyms: excitability |
| (noun) an irritable petulant feeling | Synonyms: choler, crossness, fretfulness, fussiness, peevishness, petulance |
| irritable | (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
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| (adjective) capable of responding to stimuli | Synonyms: excitable |
| (adjective) abnormally sensitive to a stimulus | - |
| irritably | (adverb) in an irritable manner | - |
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| (adverb) in a petulant manner | Synonyms: pettishly, petulantly, testily |
| irritant | (noun) something that causes irritation and annoyance | Synonyms: thorn |
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| irritate | (verb) excite to an abnormal condition, or chafe or inflame | - |
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| (verb) excite to some characteristic action or condition, such as motion, contraction, or nervous impulse, by the application of a stimulus | - |
| (verb) cause annoyance in; disturb, especially by minor irritations | Synonyms: annoy, bother, chafe, devil, get at, get to, gravel, nark, nettle, rag, rile, vex |
| irritated | (adjective) aroused to impatience or anger | Synonyms: annoyed, miffed, nettled, peeved, pissed, pissed off, riled, roiled, steamed, stung |
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| irritating | (adjective) causing irritation or annoyance | Synonyms: annoying, bothersome, galling, nettlesome, pesky, pestering, pestiferous, plaguey, plaguy, teasing, vexatious, vexing |
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| (adjective) (used of physical stimuli) serving to stimulate or excite | Synonyms: irritative |
| (adjective) causing physical discomfort | Synonyms: painful |
| irritatingly | (adverb) in an irritating manner | - |
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| irritation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: aggravation, provocation |
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| (noun) the act of troubling or annoying someone | Synonyms: annoyance, annoying, vexation |
| (noun) an uncomfortable feeling of mental painfulness or distress | Synonyms: discomfort, soreness |
| (noun) a sudden outburst of anger | Synonyms: pique, temper |
| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, botheration, vexation |
| (noun) the neural or electrical arousal of an organ or muscle or gland | Synonyms: excitation, innervation |
| (noun) (pathology) abnormal sensitivity to stimulation | - |
| irritative | (adjective) (used of physical stimuli) serving to stimulate or excite | Synonyms: irritating |
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| irrupt | (verb) increase rapidly and in an uncontrolled manner | Synonyms: explode |
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| (verb) erupt or intensify suddenly | Synonyms: break open, burst out, erupt, flare, flare up |
| (verb) enter uninvited | Synonyms: intrude |
| irruption | (noun) a sudden violent entrance; a bursting in | - |
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| (noun) a sudden violent spontaneous occurrence (usually of some undesirable condition) | Synonyms: eruption, outbreak |
| (noun) a sudden sharp increase in the relative numbers of a population | - |
| irruptive | (adjective) of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro | Synonyms: plutonic |
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