| impact | (noun) influencing strongly | Synonyms: encroachment, impingement |
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| (noun) the violent interaction of individuals or groups entering into combat | Synonyms: shock |
| (noun) the striking of one body against another | - |
| (noun) a forceful consequence; a strong effect | Synonyms: wallop |
| (verb) have an effect upon | Synonyms: affect, bear on, bear upon, touch, touch on |
| (verb) press or wedge together; pack together | - |
| impacted | (adjective) wedged or packed in together | Synonyms: wedged |
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| impaction | (noun) a sharp collision produced by striking or dashing against something | Synonyms: impingement |
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| (noun) a disorder in which a tooth is so crowded in its socket that it cannot erupt normally | Synonyms: impacted tooth |
| (noun) a disorder in which feces are impacted in the lower colon | - |
| (noun) the condition of being pressed closely together and firmly fixed | - |
| impair | (verb) make worse or less effective | - |
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| (verb) make imperfect | Synonyms: deflower, mar, spoil, vitiate |
| impaired | (adjective) diminished in strength, quality, or utility | - |
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| (adjective) mentally or physically unfit | Synonyms: afflicted |
| impairer | (noun) an agent that impairs | - |
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| impairment | (noun) damage that results in a reduction of strength or quality | - |
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| (noun) the act of making something futile and useless (as by routine) | Synonyms: constipation, deadening, stultification |
| (noun) the occurrence of a change for the worse | Synonyms: damage, harm |
| (noun) the condition of being unable to perform as a consequence of physical or mental unfitness | Synonyms: disability, disablement, handicap |
| (noun) a symptom of reduced quality or strength | Synonyms: deterioration |
| impala | (noun) African antelope with ridged curved horns; moves with enormous leaps | Synonyms: Aepyceros melampus |
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| impale | (verb) pierce with a sharp stake or point | Synonyms: empale, spike, transfix |
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| (verb) kill by piercing with a spear or sharp pole | Synonyms: stake |
| impalement | (noun) the act of piercing with a sharpened stake as a form of punishment or torture | - |
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| impalpability | (noun) the quality of being intangible and not perceptible by touch | Synonyms: intangibility, intangibleness |
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| (noun) Ungraspability by or inapprehensibility to the mind. | - |
| impalpable | (adjective) imperceptible to the senses or the mind | - |
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| (adjective) incapable of being perceived by the senses especially the sense of touch | Synonyms: intangible |
| (adjective) not perceptible to the touch | - |
| impalpably | (adverb) not substantially; lacking substantial expression or fullness | Synonyms: insubstantially |
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| impanel | (verb) select from a list | Synonyms: empanel, panel |
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| (verb) enter into a list of prospective jurors | Synonyms: empanel |
| imparipinnate | (adjective) (a leaf shape) pinnate with a single leaflet at the apex | Synonyms: odd-pinnate |
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| impart | (verb) transmit or serve as the medium for transmission | Synonyms: carry, channel, conduct, convey, transmit |
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| (verb) transmit (knowledge or skills) | Synonyms: give, leave, pass on |
| (verb) bestow a quality on | Synonyms: add, bestow, bring, contribute, lend |
| impartation | (noun) the transmission of information | Synonyms: conveyance, imparting |
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| impartial | (adjective) showing lack of favoritism | - |
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| (adjective) free from undue bias or preconceived opinions | Synonyms: unprejudiced |
| impartiality | (noun) an inclination to weigh both views or opinions equally | Synonyms: nonpartisanship |
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| impartially | (adverb) in an impartial manner | - |
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| imparting | (noun) the transmission of information | Synonyms: conveyance, impartation |
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| impassable | (adjective) incapable of being passed | Synonyms: unpassable |
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| impasse | (noun) a street with only one way in or out | Synonyms: blind alley, cul de sac, dead-end street |
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| (noun) a situation in which no progress can be made or no advancement is possible | Synonyms: dead end, deadlock, stalemate, standstill |
| impassioned | (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, fiery, perfervid, torrid |
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| impassive | (adjective) deliberately impassive in manner | Synonyms: deadpan, expressionless, poker-faced, unexpressive |
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| (adjective) having or revealing little emotion or sensibility; not easily aroused or excited | Synonyms: stolid |
| impassively | (adverb) in an impassive manner | - |
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| impassiveness | (noun) apathy demonstrated by an absence of emotional reactions | Synonyms: emotionlessness, impassivity, indifference, phlegm, stolidity, unemotionality |
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| impassivity | (noun) apathy demonstrated by an absence of emotional reactions | Synonyms: emotionlessness, impassiveness, indifference, phlegm, stolidity, unemotionality |
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| impasto | (noun) painting that applies the pigment thickly so that brush or palette knife marks are visible | - |
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| impatience | (noun) a dislike of anything that causes delay | - |
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| (noun) a restless desire for change and excitement | - |
| (noun) a lack of patience; irritation with anything that causes delay | Synonyms: restlessness |
| impatient | (adjective) restless or short-tempered under delay or opposition | - |
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| (adjective) (usually followed by `to') full of eagerness | Synonyms: raring |
| impatiently | (adverb) with impatience; in an impatient manner | - |
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