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imposition something assigned or demanded, such as a duty, burden, or requirement. [4 definitions]
impossibility the state or quality of being impossible. [2 definitions]
impossible not able to happen, exist, or be done. [3 definitions]
impossibly in an impossible way. [3 definitions]
impost a tax or duty, such as a customs fee. [2 definitions]
impostor one who defrauds or deceives by pretending to be another person.
imposture the act or practice, or an instance of deceiving by taking on a false identity.
impotence the condition or trait of being impotent; weakness; ineffectiveness. [3 definitions]
impotency impotence.
impotent lacking strength, effectiveness, or capability. [3 definitions]
impound to shut up or confine (an animal) in a pound. [3 definitions]
impoverish to make poor; cause to live in poverty. [2 definitions]
impracticable not capable of being put into practice or carried out.
impractical not useful or wise to put into practice; not workable. [2 definitions]
imprecate to invoke (a curse, disaster, or the like) on another.
imprecation a curse, uttered or thought of. [2 definitions]
imprecise not exact, accurate, or well-defined; not precise; vague.
imprecision the condition or quality of being imprecise. [2 definitions]
impregnable1 able to withstand any attack, as a fortress. [2 definitions]
impregnable2 capable of being impregnated or fertilized, as an egg.
impregnate to make (a female animal or human) pregnant, or to make (an egg) fertile. [2 definitions]