| 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 |
| 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 | - |
| 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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| 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. | - |
| impartation | (noun) the transmission of information | Synonyms: conveyance, imparting |
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| impartiality | (noun) an inclination to weigh both views or opinions equally | Synonyms: nonpartisanship |
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| imparting | (noun) the transmission of information | Synonyms: conveyance, impartation |
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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 |
| 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 |