| imperative | (adjective) requiring attention or action | - |
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| (adjective) relating to verbs in the imperative mood | - |
| imperceptible | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: unperceivable |
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| imperfect | (adjective) not perfect; defective or inadequate | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: fallible, frail, weak |
| imperfectible | (adjective) capable of being made imperfect | - |
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| imperforate | (adjective) not perforated; having no opening | - |
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| imperial | (adjective) befitting or belonging to an emperor or empress | - |
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| (adjective) relating to or associated with an empire | - |
| (adjective) of or belonging to the British Imperial System of weights and measures | - |
| (adjective) belonging to or befitting a supreme ruler | Synonyms: majestic, purple, regal, royal |
| imperialist | (adjective) of or relating to imperialism | Synonyms: imperialistic |
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| imperialistic | (adjective) of or relating to imperialism | Synonyms: imperialist |
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| imperious | (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: disdainful, haughty, lordly, overbearing, prideful, sniffy, supercilious, swaggering |
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| imperishable | (adjective) not perishable | - |
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| (adjective) lasting a long time | Synonyms: abiding, enduring |
| impermanent | (adjective) not permanent; not lasting | Synonyms: temporary |
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| (adjective) existing or enduring for a limited time only | - |
| impermeable | (adjective) preventing especially liquids to pass or diffuse through | - |
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| impermissible | (adjective) not permitted | - |
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| (adjective) not allowable | - |
| impersonal | (adjective) not relating to or responsive to individual persons | - |
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| (adjective) having no personal preference | Synonyms: neutral |
| impertinent | (adjective) improperly forward or bold | Synonyms: fresh, impudent, overbold, sassy, saucy, smart, wise |
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| (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, orthogonal |
| (adjective) characterized by a lightly pert and exuberant quality | Synonyms: irreverent, pert, saucy |
| imperturbable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: unflappable |
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| imperviable | (adjective) not admitting of passage or capable of being affected | Synonyms: impervious |
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| impervious | (adjective) not admitting of passage or capable of being affected | Synonyms: imperviable |
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| intemperate | (adjective) excessive in behavior | - |
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| (adjective) (of weather or climate) not mild; subject to extremes | - |
| (adjective) given to excessive indulgence of bodily appetites especially for intoxicating liquors | Synonyms: hard, heavy |
| pampering | (adjective) gratifying tastes, appetites, or desires | - |
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| temperamental | (adjective) relating to or caused by temperament | - |
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| (adjective) subject to sharply varying moods | Synonyms: moody |
| (adjective) likely to perform unpredictably | Synonyms: erratic |
| temperate | (adjective) not extreme in behavior | - |
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| (adjective) (of weather or climate) free from extremes; mild; or characteristic of such weather or climate | - |
| (adjective) not extreme | Synonyms: moderate |
| tempered | (adjective) adjusted or attuned by adding a counterbalancing element | - |
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| (adjective) made hard or flexible or resilient especially by heat treatment | Synonyms: hardened, toughened, treated |
| tempering | (adjective) moderating by making more temperate | - |
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| unhampered | (adjective) not held in check or subject to control | - |
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| (adjective) not slowed or blocked or interfered with | Synonyms: unhindered |
| untempered | (adjective) not moderated or controlled | - |
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| (adjective) not brought to a proper consistency or hardness | Synonyms: unhardened |