| impeccable | (adjective) without fault or error | Synonyms: faultless, immaculate, incorrupted |
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| (adjective) not capable of sin | - |
| impeccant | (adjective) free from sin | Synonyms: innocent, sinless |
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| impecunious | (adjective) not having enough money to pay for necessities | Synonyms: hard up, in straitened circumstances, penniless, penurious, pinched |
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| impeded | (adjective) made difficult or slow | - |
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| impeding | (adjective) preventing movement | Synonyms: clogging, hindering, obstructive |
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| impelled | (adjective) urged or forced to action through moral pressure | Synonyms: driven |
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| impellent | (adjective) forcing forward or onward; impelling | - |
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| impelling | (adjective) markedly effective as if by emotional pressure | - |
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| impendent | (adjective) close in time; about to occur | Synonyms: at hand, close at hand, imminent, impending |
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| impending | (adjective) close in time; about to occur | Synonyms: at hand, close at hand, imminent, impendent |
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| impenetrable | (adjective) not admitting of penetration or passage into or through | - |
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| (adjective) impossible to understand | - |
| (adjective) permitting little if any light to pass through because of denseness of matter | Synonyms: dense, heavy |
| impenitent | (adjective) not penitent or remorseful | Synonyms: unremorseful, unrepentant |
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| (adjective) impervious to moral persuasion | - |
| 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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| impetiginous | (adjective) of or relating to or having impetigo | - |
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| impetuous | (adjective) marked by violent force | - |
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| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, hotheaded, impulsive, madcap, tearaway |