| 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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| 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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| 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 | - |
| iritic | (adjective) of or relating to located near the iris of the eye | - |
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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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| 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 |
| 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 |
| ironlike | (adjective) exhibiting strength or hardness like that of iron | - |
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| ironshod | (adjective) shod or cased with iron | - |
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| irrational | (adjective) not consistent with or using reason | - |
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| (adjective) real but not expressible as the quotient of two integers | - |
| 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 |
| 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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| 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 | - |
| irrelevant | (adjective) having no bearing on or connection with the subject at issue | - |
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| irreligious | (adjective) hostile or indifferent to religion | - |
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| irremediable | (adjective) impossible to remedy or correct or redress | - |
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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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| irreplaceable | (adjective) impossible to replace | Synonyms: unreplaceable |
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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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| irreproducible | (adjective) impossible to reproduce or duplicate | Synonyms: unreproducible |
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| irresistible | (adjective) impossible to resist; overpowering | Synonyms: resistless |
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| (adjective) overpoweringly attractive | - |
| irresolute | (adjective) uncertain how to act or proceed | - |
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| irresponsible | (adjective) showing lack of care for consequences | - |
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| irretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: unretrievable |
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| 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 |
| irreversible | (adjective) incapable of being reversed | - |
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| irrevocable | (adjective) incapable of being retracted or revoked | Synonyms: irrevokable |
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| irrevokable | (adjective) incapable of being retracted or revoked | Synonyms: irrevocable |
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| 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 | - |
| 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 |
| irritative | (adjective) (used of physical stimuli) serving to stimulate or excite | Synonyms: irritating |
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| irruptive | (adjective) of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro | Synonyms: plutonic |
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