| impeach | (verb) bring an accusation against; level a charge against | Synonyms: accuse, criminate, incriminate |
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| (verb) charge (a public official) with an offense or misdemeanor committed while in office | - |
| (verb) challenge the honesty or veracity of | - |
| impeachability | (noun) the state of being liable to impeachment | Synonyms: indictability |
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| impeachment | (noun) a formal document charging a public official with misconduct in office | - |
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| impeccability | (noun) the quality of being exempt from sin or incapable of sinning | - |
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| (noun) the quality of being without an error or fault | Synonyms: faultlessness |
| impeccable | (adjective) without fault or error | Synonyms: faultless, immaculate, incorrupted |
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| (adjective) not capable of sin | - |
| impeccably | (adverb) flawlessly | - |
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| 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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| impecuniousness | (noun) a state of lacking money | Synonyms: pennilessness, penuriousness |
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| impedance | (noun) a material's opposition to the flow of electric current; measured in ohms | Synonyms: electric resistance, electrical resistance, ohmic resistance, resistance, resistivity |
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| impede | (verb) block passage through | Synonyms: block, close up, jam, obstruct, obturate, occlude |
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| (verb) be a hindrance or obstacle to | Synonyms: hinder |
| impeded | (adjective) made difficult or slow | - |
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| impediment | (noun) any structure that makes progress difficult | Synonyms: impedimenta, obstructer, obstruction, obstructor |
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| (noun) something immaterial that interferes with or delays action or progress | Synonyms: balk, baulk, check, deterrent, handicap, hinderance, hindrance |
| impedimenta | (noun) the baggage and equipment carried by an army | - |
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| (noun) any structure that makes progress difficult | Synonyms: impediment, obstructer, obstruction, obstructor |
| impeding | (adjective) preventing movement | Synonyms: clogging, hindering, obstructive |
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| impel | (verb) cause to move forward with force | Synonyms: propel |
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| (verb) urge or force (a person) to an action; constrain or motivate | Synonyms: force |
| 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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| impeller | (noun) the blade of a rotor (as in the compressor of a jet engine) | - |
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| impelling | (adjective) markedly effective as if by emotional pressure | - |
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| impend | (verb) be imminent or about to happen | - |
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| impendence | (noun) the state of being imminent and liable to happen soon | Synonyms: forthcomingness, imminence, imminency, imminentness, impendency |
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| impendency | (noun) the state of being imminent and liable to happen soon | Synonyms: forthcomingness, imminence, imminency, imminentness, impendence |
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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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| impenetrability | (noun) the quality of being impenetrable (by people or light or missiles etc.) | Synonyms: imperviousness |
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| (noun) incomprehensibility by virtue of being too dense to understand | Synonyms: impenetrableness |
| 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 |
| impenetrableness | (noun) incomprehensibility by virtue of being too dense to understand | Synonyms: impenetrability |
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| impenitence | (noun) the trait of refusing to repent | Synonyms: impenitency |
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| impenitency | (noun) the trait of refusing to repent | Synonyms: impenitence |
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| impenitent | (adjective) not penitent or remorseful | Synonyms: unremorseful, unrepentant |
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| (adjective) impervious to moral persuasion | - |
| impenitently | (adverb) in an impenitent manner | Synonyms: unrepentantly |
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| imperative | (adjective) requiring attention or action | - |
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| (adjective) relating to verbs in the imperative mood | - |
| (noun) some duty that is essential and urgent | - |
| (noun) a verb in the imperative mood. | Synonyms: imperative verb |
| (noun) a mood that expresses an intention to influence the listener's behavior | Synonyms: imperative form, imperative mood, jussive mood |
| imperatively | (adverb) in an imperative and commanding manner | Synonyms: peremptorily |
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| imperativeness | (noun) the quality of being insistent | Synonyms: instancy |
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| (noun) the state of demanding notice or attention | Synonyms: insistence, insistency, press, pressure |
| imperceptibility | (noun) the property of being imperceptible by the mind or the senses | - |
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| imperceptible | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: unperceivable |
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| imperceptibly | (adverb) in an imperceptible manner or to an imperceptible degree | Synonyms: unnoticeably |
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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 |
| (noun) a tense of verbs used in describing action that is on-going | Synonyms: continuous tense, imperfect tense, progressive, progressive tense |
| imperfectibility | (noun) the capability of becoming imperfect | - |
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| imperfectible | (adjective) capable of being made imperfect | - |
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| imperfection | (noun) the state or an instance of being imperfect | Synonyms: imperfectness |
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| imperfective | (noun) aspect without regard to the beginning or completion of the action of the verb | Synonyms: imperfective aspect |
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| imperfectly | (adverb) in an imperfect or faulty way | Synonyms: amiss |
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| imperfectness | (noun) the state or an instance of being imperfect | Synonyms: imperfection |
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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 |
| (noun) a piece of luggage carried on top of a coach | - |
| (noun) a small tufted beard worn by Emperor Napoleon III | Synonyms: imperial beard |
| imperialism | (noun) any instance of aggressive extension of authority | - |
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| (noun) a political orientation that advocates imperial interests | - |
| (noun) a policy of extending your rule over foreign countries | - |
| imperialist | (adjective) of or relating to imperialism | Synonyms: imperialistic |
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| (noun) a believer in imperialism | - |
| imperialistic | (adjective) of or relating to imperialism | Synonyms: imperialist |
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| imperially | (adverb) in an imperial manner | - |
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| imperialness | (noun) The quality of being related to an empire, emperor, or empress. | - |
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| imperil | (verb) pose a threat to; present a danger to | Synonyms: endanger, jeopardise, jeopardize, menace, peril, threaten |
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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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| imperiously | (adverb) in an imperious manner | - |
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| imperiousness | (noun) the trait of being imperious and overbearing | Synonyms: domineeringness, overbearingness |
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| imperishability | (noun) the property of being resistant to decay | Synonyms: imperishableness, imperishingness |
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| imperishable | (adjective) not perishable | - |
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| (adjective) lasting a long time | Synonyms: abiding, enduring |
| imperishableness | (noun) the property of being resistant to decay | Synonyms: imperishability, imperishingness |
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| imperishingness | (noun) the property of being resistant to decay | Synonyms: imperishability, imperishableness |
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| imperium | (noun) supreme authority; absolute dominion | - |
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| (noun) the domain ruled by an emperor or empress; the region over which imperial dominion is exercised | Synonyms: empire |
| impermanence | (noun) the property of not existing for indefinitely long durations | Synonyms: impermanency |
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| impermanency | (noun) the property of not existing for indefinitely long durations | Synonyms: impermanence |
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| impermanent | (adjective) not permanent; not lasting | Synonyms: temporary |
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| (adjective) existing or enduring for a limited time only | - |
| impermeability | (noun) the property of something that cannot be pervaded by a liquid | Synonyms: impermeableness |
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| impermeable | (adjective) preventing especially liquids to pass or diffuse through | - |
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| impermeableness | (noun) the property of something that cannot be pervaded by a liquid | Synonyms: impermeability |
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| impermissibility | (noun) inadmissibility as a consequence of not being permitted | - |
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| impermissible | (adjective) not permitted | - |
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| (adjective) not allowable | - |
| impermissibly | (adverb) not permissibly | - |
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| impersonal | (adjective) not relating to or responsive to individual persons | - |
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| (adjective) having no personal preference | Synonyms: neutral |
| impersonally | (adverb) without warmth | - |
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| (adverb) in an impersonal manner | - |
| impersonate | (verb) pretend to be someone you are not; sometimes with fraudulent intentions | Synonyms: personate, pose |
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| (verb) represent another person with comic intentions | - |
| (verb) assume or act the character of | Synonyms: portray |
| impersonation | (noun) imitating the mannerisms of another person | Synonyms: personation |
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| (noun) pretending to be another person | Synonyms: imposture |
| (noun) a representation of a person that is exaggerated for comic effect | Synonyms: caricature, imitation |
| impersonator | (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: imitator |
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| impertinence | (noun) inappropriate playfulness | Synonyms: archness, perkiness, pertness, sauciness |
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| (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impudence, insolence |
| (noun) an impudent statement | Synonyms: cheek, impudence |
| 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 |
| impertinently | (adverb) in an impudent or impertinent manner | Synonyms: freshly, impudently, pertly, saucily |
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| imperturbability | (noun) calm and unruffled self-assurance | Synonyms: coolness, imperturbableness |
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| imperturbable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: unflappable |
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| imperturbableness | (noun) calm and unruffled self-assurance | Synonyms: coolness, imperturbability |
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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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| imperviousness | (noun) the quality of being impenetrable (by people or light or missiles etc.) | Synonyms: impenetrability |
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| impetiginous | (adjective) of or relating to or having impetigo | - |
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| impetigo | (noun) a very contagious infection of the skin; common in children; localized redness develops into small blisters that gradually crust and erode | - |
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| impetuosity | (noun) rash impulsiveness | Synonyms: impetuousness |
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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 |
| impetuously | (adverb) in an impulsive or impetuous way; without taking cautions | Synonyms: impulsively |
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| impetuousness | (noun) rash impulsiveness | Synonyms: impetuosity |
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| impetus | (noun) the act of applying force suddenly | Synonyms: impulse, impulsion |
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| (noun) a force that moves something along | Synonyms: drift, impulsion |