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impersonate to act or assume the character of; pretend to be (another real or fictitious person or type of person).
impertinence rudeness or insolence in action or speech. [3 definitions]
impertinent rude or impudent. [2 definitions]
imperturbable not easily excited or disturbed; calm.
impervious not allowing penetration or passage. [3 definitions]
impetigo an infectious skin disease, esp. among children, marked by pustules that erupt and form thick crusts, esp. on the face.
impetuosity the state or condition of being impetuous. [2 definitions]
impetuous sudden and impulsive. [2 definitions]
impetus something that urges or impels; a driving force. [2 definitions]
impiety lack of reverence or respect, esp. for what others consider sacred. [2 definitions]
impinge to strike or collide with something (usu. fol. by "on" or "upon"). [3 definitions]
impious lacking in reverence or respect; irreverent.
impish of or like an imp, esp. in behavior or appearance; mischievous.
implacable not to be placated or diverted; unappeasable or inexorable.
implant to plant or embed in something. [3 definitions]
implantable combined form of implant.
implausible hard to believe or credit.
implement something used in order to accomplish a particular thing, esp. a tool, device, or instrument to perform a task. [4 definitions]
implementation the act, process, or way of carrying (something) out or putting (something) into effect.
implicate to involve or prove involvement of (someone or something) in an affair, situation, event, or series of events.
implication the act of stating something indirectly; act of implying. [4 definitions]