1.impartial a.(in, to)不偏不倚的，公正的(fair)

词根记忆：im(不)+partial(偏见的)--没有偏见的--公正的

例：Impart/al criticism公正的批评

派生词：impartially (ad.公平地)

2.impeachment n．弹劾，控告(the act or process of impeaching)．

词根记忆：来自impeach(矿弹劾，控告)

例：Not until Barbara Jordan's participation in the hearings on the impeachment of President Richard Nixon in 1974 was she made a nationally recognized figure.

3.impede v.妨碍，阻碍(to hinder)

词根记忆：im(进入)+pede(脚)--插足--妨碍

例：The reluctance to abandon this hypothesis impeded new research.

派生词：impediment(n．防碍，阻碍物)

同根词：centipede(n．蜈蚣)

4.imperative a．必要的(absolutely necessary)；紧急的(urgent)；命令的(mandatory)

词根记忆：imper(命令)+ative--命令的--紧急的

例：Reform of the tort system is imperative for bringing malpractice insurance premiums under control.

派生词：imperatively( ad.命令式地)

5.implausible a．难以置信的( unbelievable)

词根记忆：im(不)+plausible(可信的)--不可信的--难以置信的

例：It is implausible that the butler killed the cook, because he was in London then.

6.implement v.实施，贯彻(to carry out, accomplish) n.[常pl.]工具(tool, appliance)

词根记忆：im+pIe(满)+ment--（使）圆满--贯彻

例：Our company implemented "shift-work equations" to reduce sickness and fatigue among shift workers.//stone implements石制工具

派生词：implementation(n.执行)

7.implementation n.实现(accomplishment)；履行(the act of implementing)

词根记忆：来自implement(v.实施；实现)

例：The procedures for congressional approval and implementation of federal Indian policy were made more precise.

同根词：complement(v.补足；n.补足物)

8.implication n.含义(significance)；[常pl.]推断，结论(conclude, deduce)

词根记忆：来自implicate(v.暗示)

例：Some analysts believe that wage-work had other implications for women's identities and consciousness.

9.implicit a.含蓄的(hinted, indirect)；潜在的(potential)

联想记忆：im(进入)+plic(重叠)+it--（意义）叠在里面--含蓄的

例：implicit conclusions舍蓄的结论 //an implicit contradiction潜在的矛盾

同根词：explicit(a．直率的，清楚)