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improved
improvement
improvident
improvise
improvised explosive device
imprudent
impudent
impudicity
impugn
impulse
impulse buying
impulse purchase
impulsion
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impunity
impure
impurity
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impugn

im·pugn [ im pyn ] (past and past participle im·pugned, present participle im·pugn·ing, 3rd person present singular im·pugns)


transitive verb 
Definition:
 
criticize or cast doubt on: to suggest that something cannot be trusted, relied on, or respected
Far be it from me to impugn his motives, but ...

[14th century. < Latin impugnare "fight against" < pugnare "to fight" < pugnus "fist"]

im·pugn·a·ble adjective
im·pugn·er noun
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